Fiat is worth because the people give it worth. The US-dollar is a good example: in the past it was backed with gold, which gave the dollar the worth it had. At the year 1971 it was dissolved from President Richard Nixon. Now we only believe in the worth it had.
In crypto we have an active market, where it gains its worth from supply and demand. The decentralized topic is a plus to that.
In every country we have different rules for crypto and we saw countries ban crypto. But it will never happen that the whole world agrees on to ban crypto. There will be always a country which says: Hey they ban crypto, but we don’t, so come to us then.