Cryptos can very well be used in the countries with troubled economies. But those  cryptos have to be bught from the free market and not the one created by their government. That will lead to even bigger failure. Take example of Venezuela and petro currency. Both The petro and Venezuela's economy are big failures. It will only make sense if those cryptos are directly bought from the market using strong currencies like USD, EUR etc. This way we can seclude the crypto market from the risk of their weak economy and the influences of their corrupt governments!