20 years puts him away until he's 50s. I don't see any tangible benefits to society there. His behavior is idolized in culture (Wolf of Wallstreet etc) and the real solution is a new base layer of trust. If this was a violent crime, that's different, because somebody was left physically impaired. In this case the conmen that funded him, and gambling junkies without first principles got a taste of what "crypto" will always do to you.