I really don't know anything about the subject but I think stolen cash is much more hard to conceal and to move. It can be marked also and tracked (or so they say in the movies). You need to justify its possession. You cannot go to the airport with an arbitrary amount of money.
> You cannot go to the airport with an arbitrary amount of money.
This is actually a major problem in the U.S. where the fourth amendment is supposed to protect against unreasonable seizure. It is not illegal to carry cash, but federal and local law enforcement agencies will by policy seize cash without charging anyone with a crime. The victim needs to sue to get their money back, and then the agencies use tax-payer dollars to fight it. This is a clear violation of the 4th amendment, but is absolutely rampant.
If we don't fix these problems with cash, you can bet they'll come for your crypto when it becomes popular enough.