Only the rich in those countries managed to exchange their local currency for foreign cash in time, everyone else saw their life savings vanish in front of their own eyes except the very few who converted their local currency to crypto in time when they saw the chips falling.
BitCoin allows kind of international currency bank account for everyone and anyone who needs it for minimal cost.
That besides the large markets for illegal goods, which is another cornerstone that's not gonna go away any time soon either, with people more or less being forced to buy crypto to get their goods.