If the government decides they want to seize or control it, they can also decide to simply imprison you for attempting to flout these restrictions via cryptocur

If the government decides they want to seize or control it, they can also decide to simply imprison you for attempting to flout these restrictions via cryptocurrency. While that isn't currently happening much (that we know about), it's inevitable this will become a more likely threat as more people attempt to use it for that purpose. And yes, I am aware that there exist cryptocurrencies that attempt (with varying degrees of success) to prevent the kind of analysis that would make this sort of enforcement possible.