I always think that government are like a mafia, imagine that X of the powerful countries are planning to add BTC to their reserves... how many people know about it before the general public? 50... 100... 1000? how many are not going to said something to his partner/couple/family? How many of them are not going to buy before?
For me... if some big country is going to add BTC we are going to know... but not by a small move... we are talking abount 5x or 10x movement.