This makes a lot of sense and it was an expected side effect of any decentralized currency from the very beginning. Bad actors/fraudsters/tax evasionists etc are going to eventually become the biggest users and end up owning a big chunk of it.

Without a shred or actual evidence, I'd be ready to bet that many terrorist groups are buying their equipment/weapons in crypto. Arms, drugs, laundering, etc, it's just so convenient.. And in time it will become worse.

That being said, I also understand that crypto is unavoidable - eg the concept of the blockchain would have been discovered sooner or later and now it can't be stopped.