Earlier quoted context omitted.
To add to that, crypto is also a gift from heaven for criminals who need to receive ransoms.
Not true by any means. Fiat is the tried and true way to commit crime. Having transcations on a ledger forever, works against your criminal take. You are just repeating.
Depends on the crimes, and up to certain values/volumes.
For 'consensual' transactional things for goods/services it could be useful (e.g., drug deals). But for ransom-like stuff, where one end of the 'transaction' is not thrilled with the 'deal', having to physically pick up the cash puts the perp at risk.