The single over-riding principle that makes cryptocurrency accounts attractive to criminals is not the supposed anonymity (that argument is a done deal except for those who don't know what they are talking about) but the fact that, by design, there is, literally, no single body or person with regulatory authority.
What that means is that, while governments and courts (at the behest of victims) can make Asset Recovery Orders, or, as the US government is trying to do with its listing on OFAC of crypto-currency accounts that it claims it has reasonably identified as connected to listed persons, these are after the fact restrictions and to try to enforce them is, by reason of the essence of the distributed ledger, only ad hoc.
There is another way....
