A lot of developing countries prohibit currency exchange. For example I moved from the US to Tanzania about 6 months ago and the government has outlawed currency exchanges. There are only 2 ways to get USD: 1) the black market, which is expensive, 10% above the “fair” price 2) the National bank, which is 25% over the “fair” price.

I think BTC might be an attractive alternative here.

Moreover, by some measures, annual inflation is 7-10%. So holding the local currency is highly penalized