Lol oh I am sure if they tried it would push the prices up even higher as its now a premium to own these things and it would hurt that country as more capital flows into countries and currencies that do support it. So lets say my country blocks it, cash would flow into dollars and euros and then into gold and crypto and still weakening their currency.
They can surly try but they will fail, may look like a success in the short term but long term they kill the currency faster
It does suck for the individual, however, imagine being told you can't own your own stuff, in South Africa, we have a history of land repossession without compensation and they want to do it again or rather calls for it to do it again.
So I trust no one, I have my ledger and my seed phrases and I am off no ones stopping me