What makes you think government can't do that? US government already limit A.I/cryptography exports and forcing restrict GitHub account from some country.
They could ban specific type of cryptography which used on popular cryptocurrency such as ECDSA combined with secp256k1.
I sometimes think people are really underestimating what an insane government or political party can do!
If one of them would want to that they will!
true, but the cat is already out of the bag. if a crazy government some day pulled something like that then it will only raise a lot of alarms among regular people who were not using any kind of encryption for anything they were doing so far and they will start thinking about using it.
it's like the Snowden effect, although US Gov has been snooping but nobody was thinking about protecting themselves, when they found out about it everyone was thinking about protecting their privacy.