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• Films! Type in any film in YouTube, and unless it is a super old film with expired copyright, the only option to view it is "Buy the film!" in the right sidebar, or watch an illegal copy.
• You won't find legal copies of most podcasts on youtube. As a random example... the Courtgames Podcast distributes only via a set list of ways, and lo and behold, YouTube is not one of them. As a result, any YouTube version would be copyright infringement by the uploader. They have expressed no interest in pursuing any copying of such though.
• Similar to podcasts, some independent composers and bands don't want to work with YouTube and distribute only via radio-esque services like Spotify, where they get indemnified by the number of hearings, or websites where you only get a sample and then can buy the song or album. There have been DMCA takedowns for such illegal copies, resulting in some content just being unavailable through YouTube streaming.
  • Or via the internet at all: the only way to get a licensed copy of a local Punk-band's latest album is to buy a copy from them directly, which is then burned onto a hand-signed LaserDisk.

• Films! Type in any film in YouTube, and unless it is a super old film with expired copyright, the only option to view it is "Buy the film!" in the right sidebar, or watch an illegal copy.
• You won't find legal copies of most podcasts on youtube. As a random example... the Courtgames Podcast distributes only via a set list of ways, and lo and behold, YouTube is not one of them. As a result, any YouTube version would be copyright infringement by the uploader. They have expressed no interest in pursuing any copyright action of such though.
• Similar to podcasts, some independent composers and bands don't want to work with YouTube and distribute only via radio-esque services like Spotify, where they get indemnified by the number of hearings, or websites where you only get a sample and then can buy the song or album. There have been DMCA takedowns for such illegal copies, resulting in some content just being unavailable through YouTube streaming.
  • Or via the internet at all: the only way to get a licensed copy of a local Punk-band's latest album is to buy a copy from them directly, which is then burned onto a hand-signed LaserDisk.

Conclusion

The impending death of Malibu Media shows that the method is no longer sustainable unless you have really good evidence - which can't be obtained easily - and the problems for Strike 3 to get their targets IDs to file suit makes it hard to believe that without a substantial change to the method this niche is dead..

Catchup

If it was about mid-2019, and the two did download Malibu Media or Strike 3 Holdings adult films en masse, they'd most certainly have been successfully sued. But the playing field did change since then:

The impending death of Malibu Media shows that the original method employed by the RIAA and the adult film rightsholders might no longer be sustainable in the same way it had been before. The needed evidence since about 2020 needs to suffice much-heightened standards. Evidence to those standards can't be obtained easily. The problems shown by Strike 3 to get their defendant's IDs to properly file suit make it easy to believe that the chances to be successfully sued for downloading such content are dwindling. That doesn't make it legal!

Getting Caught: how does a torrent identify its downloaders and seeds?

if maybe in the 1st place they wouldn't even be caught.

What is caught? If you download a torrent, you start with no file and are a pure leech. Every leech tells their IP to all seeds as they ask them to send a portion of the file. Once you have downloaded any part of the file, you are both a leech and a seed at the same time: You download parts you don't yet have and distribute all parts you do already have. Only when you have the complete file you can disable seeding at all. It's also common for torrent programs that any seed prefers to answer requests from leeches that have share files.

Now, by joining the torrent, you can get the IP address of leeches just by having nothing in your database and then going through all the seeds that are partial. Now, by leeching (or just pretending to!), you can log the IP addresses of all people who seed portions or the whole torrent (or its content files) with timestamps. That's how the IP addresses were acquired in the first place. This very method was and is used by ANY company that tried and still tries to hunt infringers that used torrents.

The IP addresses were processed through geolocation (which as mentioned is faulty). In the identified state, a Lawsuit is brought against "John Doe with IP X.X.X.X at YYYY-MM-DD-HH-MM-SS", and an ex-parte motion for a subpoena made to the ISP. Up until about 2019, such a motion was usually rubberstamped, but scrutiny for such is much higher since then.

Neither Law nor torrent technology hasn't changed since 2000. Only the enforcement of copyright holders' rights became much harder!

faulty premises?

their crime isn't exactly copyright infringement

This is plain wrong. Downloading material without a license is by definition making an unlicensed copy. This is statutory copyright infringement, because it is clear as day behavior described as 17 USC 501 (a):

Anyone who violates any of the exclusive rights of the copyright owner as provided by sections 106 through 122...

And we are most certainly looking at 17 USC 106:

the owner of copyright under this title has the exclusive rights to do and to authorize any of the following: (1)to reproduce the copyrighted work in copies ...

Downloading or uploading without having a license for it, you violate law.

... but not having good enough technology to commit copyright infringement.

That is TOTALLY IRRELEVANT to the law at hand, it still is illegal. However, it expresses the sentiment of they broke the law and got away with it. This actually is starting to happen since about 2020 in torrent cases, as elaborated above.

fine maybe but all [content] are free for stream?

No. There's music and content that most certainly is not allowed to even be on YouTube by the rightsholders. A few examples:

• Films! Type in any film in YouTube, and unless it is a super old film with expired copyright, the only option to view it is "Buy the film!" in the right sidebar, or watch an illegal copy.
• You won't find legal copies of most podcasts on youtube. As a random example... the Courtgames Podcast distributes only via a set list of ways, and lo and behold, YouTube is not one of them. As a result, any YouTube version would be copyright infringement by the uploader. They have expressed no interest in pursuing any copying of such though.
• Similar to podcasts, some independent composers and bands don't want to work with YouTube and distribute only via radio-esque services like Spotify, where they get indemnified by the number of hearings, or websites where you only get a sample and then can buy the song or album. There have been DMCA takedowns for such illegal copies, resulting in some content just being unavailable through YouTube streaming.
  • Or via the internet at all: the only way to get a licensed copy of a local Punk-band's latest album is to buy a copy from them directly, which is then burned onto a hand-signed LaserDisk.

If it was porn... Up until ca 2020 the answer would be likely

There's a huge market in adult films, and it has bought up some of the most aggressive litigants ever.  Prenda Law was such an enterprise, which worked with less than clean hands as they hade uploaded the videos to the torrent swarm themselves and there were other shenanigans. All members of this group are disbarred or dead.

Up until about 2020, Strike 3 Holdings had become one of the most active litigants, Their method was to sue IP addresses for infringement to subpoena subscriber addresses from the ISPs and then try to force the newly claimed defendant to settle. However, around 2020, their system collapsed:

• As an example of the method: in 2019, Strike 3 Holdings secured a judgment against a non-appearing defendant.
• Geolocation wasn't a good identification even in 2019, before VPN became as widespread as it is in 2022, leading to occasional lost cases.
• By 2019, courts became increasingly hostile to Strike 3 Holding: what in 2015 would have been a slam-dunk case for Strike 3, was thrown out. repeatedly. Something that didn't stop in 2020.
• Atop that, in or before February 2020, Strike3 Holding lost against a defendant, and the defendant was awarded costs and fees - in a rather huge amount.
• As courts stopped giving Strike 3 Holdings the subpoenas easily anymore, they went to a Florida State Court to get subpoenas for subscribers. However, suing in the wrong jurisdiction first so they can file with a name in the right one, even if they knew where the correct venue was, might be an abuse of process - though if that works depends on the judge.
• In late 2021, an application to search the harddrive of the subscriber to prove the holdings allegation was denied - The court found they need to have the evidence before they allege the wrongdoing, and fishing expeditions were not ok.
• More recently, Geolocation from an IP address was deemed not enough to establish who a user is.

A similar company was Malibu Media, a little older than Strike3 Holdings. They had filed about 9000 cases in the 10 years from 2012 to 2022. But in late 2019, they were struck with a verdict to pay the fees for a defendant in one of their cases during a streak of losses. Why? They didn't even bother to present evidence. They also lost their lawyer in late 2019 and were sued for outstanding bills. That verdict to pay the lawyer fees of the defendant - just abotu 50000 USD, wasn't paid even in late 2021. As a subsequent hearing showed, the company was pretty much bancrupt. And then they tried to hide away assets from the lost case in 2022. Which might actually be criminal.

If it was porn via torrent... Up until ca. 2020 the answer would be: it was likely to be sued if downloading much of it

There's a huge market in adult films, and it has bought up some of the most aggressive litigants ever. 

Prenda Law was such an enterprise, which worked with less than clean hands as they had uploaded the videos to the torrent swarm themselves and there were other shenanigans. All members of this group are disbarred or dead.

Up until about 2020, Strike 3 Holdings had quickly become one of two most active litigants in 2019/20. Their method was to sue IP addresses for infringement to subpoena subscriber addresses from the ISPs and then try to force the newly claimed defendant to settle while simultaneously keeping up the updated lawsuit. As an example of the method, I have a case from 2019, where Strike 3 Holdings secured a judgment against a non-appearing defendant. However, around 2019, their system also started to fray and collapse on some key points:

• Geolocation wasn't a good identification even in 2019, before VPN became as widespread as it is in 2022, leading to occasional lost cases.
• By 2019, courts became increasingly hostile to Strike 3 Holding: what in 2015 would have been a slam-dunk case for Strike 3, was thrown out. repeatedly. Something that didn't stop in 2020.
• Atop that, in or before February 2020, Strike3 Holding lost against a defendant, and the defendant was awarded costs and fees - in a rather huge amount.
• As courts stopped giving Strike 3 Holdings the subpoenas easily anymore, they went to a Florida State Court to get subpoenas for subscribers. However, suing in the wrong jurisdiction first so they can file with a name in the right one, even if they knew where the correct venue was, might be an abuse of process - though if that works depends on the judge.
• In late 2021, an application to search the harddrive of the subscriber to prove the holdings allegation was denied - The court found they need to have the evidence before they allege the wrongdoing, and fishing expeditions were not ok.
• More recently, Geolocation from an IP address was deemed not enough to establish who a user is.

A similar company was Malibu Media, a little older than Strike3 Holdings. They had filed about 9000 cases in the 10 years from 2012 to 2022. But in late 2019, they were struck with a verdict to pay the fees for a defendant in one of their cases during a streak of losses. Why? They didn't even bother to present evidence. They also lost their lawyer in late 2019 and were sued for outstanding bills. That verdict to pay the lawyer fees of the defendant - just abotu 50000 USD, wasn't paid even in late 2021. As a subsequent hearing showed, the company was pretty much bancrupt. And then they tried to hide away assets from the lost case, leading to inflated costs of over 100000 in 2022. Which might actually be criminal.