There are a few governments that have legalized the use of crypto currency in their country and the most popular of them all as it stands is El Salvador and this acceptance is driven with the expectation that bitcoin could help improve their economy and sustain it to cover certain debts. And there's a prospect that in the next ten years to come more countries would be able to accept the use of bitcoin along side their local currency alternatively,

Many countries that are currently not giving room to bitcoin to operate is as a result of the decentralization of the coin, every government wants a currency they can regulate  and be in charge over it's usage and for that they fear risking that economic power.