As for me, Bitcoin is useful not only in a country where there is troubled economy but also to all the countries. Fiat money is an old money that should be replace with something that perfectly fits the circumstances of the present. And that would be Bitcoin, the leader of all digital currencies. However, we should not look at Bitcoin as a healer of a troubled economy. It is just a currency.
Your thinking is too narrow, you just look at the usefulness of bitcoin with your perspective and not recognize the perspective of the whole world, you join and feel bitcoin is useful but the world and many countries do not participate in bitcoin, they can not see the usefulness. In addition, the economy is troubled and problematic, this is mainly due to the management of the government and the people of a country, they lack so much knowledge, and Bitcoin can not help them supplement it, it's just a tool