The use of BTC in Venezuela for payment & reserve has become commonplace, their cryptocurrency Petro actually exists only as a joke of the national bank.
Of course, the price of BTC varies hour by day, so a stable coin like USDT will be the optimal solution in the time of inflation of the national currency. However, national governments will not accept that, because it means they give up the right to manipulate the national economy.
We all see the answer, but don't know the best way to apply it to problem solving.