He clearly knew what he was doing was wrong.
Why shouldn’t there be some criminal statute to punish him? Nothing here fixes any of the harm he’s caused. It just (hopefully) prevents him from doing it in the future.
Though based on how he got here I’m guessing he’ll find a new way.
Virtually every crime costs other people time and money. We generally draw a line between that and more severe varieties of crime, such as those involving physical violence.
Seeing as how he is not required to make his victims whole, even prison time is getting off lightly.
Other criminals don't usually get to keep the proceeds of their crimes, even with prison time.
If the court ordered prison this time, he still gets to enjoy the proceeds when he gets out.