You can't mix capitalists and communists, lazy people who live in communist country will get benefit because they don't have to try harder to earn decent. While hardworking people who live in capitalist country will be uncomfortable because they spend their effort and time, but didn't get a same reward like they spent.
Economically developing nations would also benefit base on the introduction of a stable currency, which would form a base for future economic development.
Like USDT and USDC? They are just like fiat.
And they're allow every countries in the world, Tether currently restrict 10 countries
https://tether.to/ru/in-what-countries-and-states-does-tether-have-limited-functionality/