It would be a necessity and extremely easy. It's not preventing authoritarian states from doing anything. Men with guns in riot gear just show up and seize all of your hardware, and whatever other property you own that they want. See China's current mining crackdown if you don't believe me. Many authoritarian states are currently tolerating crypto because it's an excellent way to avoid international sanctions and launder hacking ransoms.

By pointing out that crypto is banned for regular North Korean citizens, did you not just prove my point that it's a worthless tool for countering authoritarianism?