But how would he get caught again? Let's say he starts a legitimate tech support business. I don't think there would be any connection between his new business license and the FTC. Nor his tax returns. I think the ONLY way he could get caught is to break ANOTHER law and end up before the FTC again.

Otherwise, I can't see how the FTC would have any idea what he's up to. It's not like businesspeople register with the FTC.