Crimes?
It gives people control over their funds it doesn't really free you since you're still bound in the same economic ecosystem, if we don't bring returns and profit in the equation if just half freedom, since well, everything is still working in fiat.
It's not a new idea and it has already being put in practice in SK, there you can withdraw from exchanges only to a wallet that is owned by another licensed service and you have to prove you have been KYCed for it, so a closed system.
So in your scenario rather than blacklisting you have whitelisting, only approved addresses are accepted, pretty doable but it will be terrible for bitcoin, it might gain legitimacy but it will also strat to lose its main purpose.
They can start that slowly
- exchanges ask you for your addresses D/W and you sign a message with them and they are stored along with your data
- payment processors do the same, again logging and whitelisting addresses
- then they come with restrictions, you can only pay from a white-label address and miners in those countries that enforce this are also forced to mine only transactions from these known addresses
- they might even set up a blockexplorer with those whitelisted addresses
Slowly but surely cracks in anonymity will start to appear since more and more of the addresses and links between them will be known, and people will become worried about sending money to an address that identifies as suspicious, and slowly from freedom you go full dystopian madness.
I'm not saying it will be done but if you elect in enough countries stupid leaders they could try to do it and while not completely able to monitor everything they will do a lot of damage.