No. The coins are open source. No gov't can "ban" them.
Well they could but it would be a real shitshow trying to enforce.
Isn't Japan trying to force exchanges to remove trading pairs? I think that has really been hurting those coins. Lol
And would probably backfire just by the free publicity if a large economy like Us tried it.
They will just figure out how to monetize and 0wn it like they do the rest of the financials, even if they have to buy every last fucking coin.