For some small countries, they use the encrypted currency to get rid of some major powers. Because they use the encrypted currency, they get rid of the big country, and the big country may launch a war.
If they want to use encrypted currency as a legal currency, they need to consider a lot.
Developing countries hopes to release the statutory currency of their own country, and now because of the fluctuations of Bitcoin, it will not think that Bitcoin acts as a legal currency.