In aforementioned countries the established financial system becomes a tool of theft by the government. Just listen to news reports or podcasts from normal folks who have to survive under these conditions. Thought you had a dollar denominated savings account? It's Liras now. Want to withdraw your money? Limited to $40US a day.

Crypto is one compelling alternative. Note, I lump a reputable USD stablecoin in here too. It's all software after all.

There does need to be a solution for countries that do this - that is to say indulge in radical devaluation; but it is clearly not BTC or ETH. It could be a properly backed and regulated crypto currency, one that also could be used without burning barrels of oil. There is no such crypto currency though, and there may never be one.