The inflation in these countries is not because of the way their economy is structured but because lack of structure and integrity. Things are not good in these countries, people don't seek to preserve the current wealth(and fail because of their currency) but they seek to get out of poverty and those who are not in poverty seek to explode their wealth so that the can buy a mansion and a Ferrari. The richer ones seek ways to hide their wealth out of the reach of the politics because in this type of countries the political situation is usually unstable and those who get very rich are cronies. When the crown falls the cronies need to have an exit strategy(sometimes they can adopt but sometimes the new crown comes with its own people) and that usually is buying property or companies overseas. Now they have the BTC option.
Therefore, in such countries people don't really keep local currency long term already(when they do, they will do it to get interest rates that at least match the inflation). The inflation rate is relevant only when doing business deals, financing projects or purchases and adjusting employee salaries. No one is losing their wealth to inflation.