I'm sure there are local traders savvy enough to get a +30% premium in local cash which they then immediately exchange for more durable assets.
So international traders wouldn't but national ones that know the country, they would.
If I could sell my crypto for +30% and then immediately use that money to buy gift cards at a store (just brainstorming here) and could put those online and redeem them and cash out with a 10% slippage, allowing me to keep +20%. Why wouldn't I do it?
I don't know such a method since I'm Western-European. But if I'd be from Venezuela, then I'd know to what extent a plan like this is feasible among: friends, family and perhaps even certain strangers.
>>Wouldn't it make more sense to use fiat from elsewhere like EUR or USD?
That's a good question. The only use-case I can see where cryptocurrencies are a better fit is when digital/international payments need to be made. Crypto allows that without any formal approval, from the state, for a USD/EUR supporting payments/e-wallet/banking firm to operate in that country.
Also international waters.
Also digital goods.
However it won't be soon. It's financial infrastructure - just different from the ordinary. And that takes decades to build. Cards were accepted at only few establishments at first too.
Wouldn't it make more sense to use fiat from elsewhere like EUR or USD? There's probably already a decent stream of it into the country (from exporters and remote workers) so exchange could be done internally, lessening the above problem. Its value is far more stable than any crypto, it can actually be used in foreign trade without lossy conversions, it's just as easy to use, you can get bank accounts, etc.