Maybe because the crimes were not computer related in nature? For example Kevin Mitnick was caught hacking and banned from computers, internet, etc. Are fraudsters typically banned from computers?
This is Crypto. Yeah nothing computer related... LOL.
Maybe that will explain some strange movements recently reported on crypto assets
related to FTX ;-)
Much more financial in nature than computational in nature. Though one could make the case for banning people from computers for financial crimes too.