I have no sympathy for Kim Dotcom, but he is not proven to be some drug cartel boss or criminal overlord. Reason he had so much cash is obvious - because back in 2012 crypto wasn't yet so successful. And the guy was US government target for a long time before arrest so he had good reason not to keep money in banks where it's easy to arrest them.

Like it or not, but if he would do anything illegal other than "copyright violation" of US companies he'll surely be in prison in New Zealand a long time ago.