Violating terms of a contract is not a criminal act.
Criminal acts require violating a statute aka a law - but not just any law, the Criminal Code, which is one law book out of about twenty.
The vast majority of law books talk about fire exits, wheelchair access, car registration fees, stuff like that.
So to commit a crime, you must violate something in one law book, and the only people who can put laws there are the Legislature and it must be signed by the governor.
Contracts are between two people, e.g. Between the internet company and you. They're not the Legislature and they can't make something a crime. If the things in the contract are too unreasonable, courts will throw them out, so they can't take your first born son, for instance.
A prosecution would be fruitless, even with CAFA
Further, in a criminal prosecution, the court and the jury both take a hard look at whether the actions really fit the crime and really warrant jail. Your case does not involve "hacking" or surreptitiously getting access users aren't entitled to; it simply involves behaving like normal users (albeit rudely) and creating new accounts after an account ban. Yes, there's a law that could be twisted beyond recognition, the Computer Fraud and Abuse Act, specifically 18 USC 1030 (a)(2)(C). It is for hacking, and that is plain.
- No prosecutor would ever charge that crime for your type of TOS violation.
- If one did, the judge would toss it out in a heartbeat. (Defense would move for summary dismissal and would get it).
- and if the judge insanely did allow the case to continue, the jury would nullify. Which is why the judge would not.
The only jail would be served by the prosecutor and possibly the company's attorneys, for contempt of court: wasting the court's time with such a ludicrous case. Contempt of court allows a judge to summarily throw someone in jail, without proof beyond reasonable doubt, jury, etc. We'll come back to that.
The reasonable alternative... And the one path to jail
What would the rationale be? Very simple. Even if the conduct were so outrageous as to enrage people into desiring a criminal consequence, the simple fact is that this can already be accomplished with civil consequence: the restraining order. The judge would tell them to take it across the street to the civil courts. And the judge would mean for the company to do that, since the D.A. Has no standing to get a restraining order to stop logging into a web site.
The restraining order would be swiftly granted, after a review of the TOS and miscreant's conduct.
Now, finally. If the miscreant violates the restraining order, then that is contempt of court, and the judge can summarily throw the miscreant in jail with nothing more than a hearing.
But mind you, a US civil contempt jailing isn't a crime, you have no 4th Amendment rights, it doesn't go on your criminal record, there's no parole or probation, it doesn't affect your gun rights, and you still tick "no" when asked about criminal convictions. It's "just" a sanction - just like being told to pay lawyer fees for the other side.