As someone with a long time in fintech, if your account is closed without explanation and nobody will talk to you, this is with almost 100% certainty the answer.

It sucks because people who have been clearly committing fraud then plaster you with negative reviews and sob stories but casually fail to mention it was their own egregiously fraudulent activity that caused their account to be shut down.

And it also sucks because people who may not have actually done anything wrong get caught up by these controls sometimes and have effectively zero recourse.