Imagine countries which have budget not more than 10 billion (milliard). Usually these countries import products from other countries and use USD for this. So some of them has national currency and their exchange rate to USD often changes (sometimes on bad side). If their economy fails on some steps, it will affect a lot to people + they depend on nat currency/usd exchange rate. National bank has to sell some usd in order to lower exchange rate and make it a little bit stable but it isn't fix.
I want to say that if they officially invest in bitcoin (they had to do it some months ago).. Imagine price is 2000$, budget is in bitcoin and after some months it rised to 6000$, they get 3x budget.
But no one cares about that.. Bitcoin is a way for them to develope quickly in an ultra fast way.