BTC would be a bad choice in any unstable economy or high inflation. A much better choice in the case of high inflation, would be the currency of the nearest large country i.e. USD, Euros, Pound. Possibly RMB.

You get a free financial system, just without the monetary policy until the country can get moving again.

BTC doesn't provide any value whatsoever as it's by design a terrible medium for exchange, and not a very good store of value.

There is no situation where BTC is useful whereupon there are not already many better solutions.