I'm assuming you are talking about "warrants in debt" and not arrest warrants. A warrant in debt is that the creditor has filed with a court for the repayment of a debt. The court will then issue a judgement (in default if you do not appear) either for the creditor or the debtor. After that, the creditor can then (if they win) seek things such as garnishment to repay the debt.
Now in the UK, they have accepted the "Electronic Communications Act of 2000" which means that a Qualified Electronic Signature (QES) is as legally binding as a "wet ink" signature. Non-QES signatures may also be binding, but that requires additional evidence.
Let's take an example of a small personal loan. Let's say you apply electronically for a loan of X amount. The loan is approved and the money is transferred into your bank account electronically. You spend the money but make no attempt to repay the loan.
First the bank will make attempts to collect the debt via normal means, then they may sell the debt to a debt collector. The debt collector will apply for a "warrant in debt" to take you to court for the amount (possibly with fees). If you do not appear, a default judgement will be applied to you.
If you signed the loan application with a QES compliant system, that signature is all the debt collector will need to show that you accepted the debt and the repayment terms. If you did not sign with a QES system, they can still submit the application but they may have to prove other things, like:
- Your intent to obtain money for some purpose
- Your action in keeping/spending the money
- No action on your part to return or rectify the transfer
- Any payments you may have made towards the loan (shows that you acknowledge the loan and terms)
So no, as of at least 2000 most countries accept some type of electronic signature to be legally binding.
An entirely different topic would be if the debt is legal without the paperwork. Many debt collection agencies buy debt in bulk that may not be much more than an Excel sheet with the amounts and names/addresses and other personal information. A lot of times the entire debt "paper trail" is not transferred with these debt purchases so a debt collector may have purchased $10 million worth of debt for $50,000 that is nothing more than an Excel sheet. I believe in the US this has held up, but I'm not sure about the UK/rest of the world.
What the YouTube people may be saying is that they don't have anything regarding the debt as far as binding paperwork goes. That may be something completely different.