Bitcoin actually doesn't require approval to be used anywhere. You can use it as long as you have internet connection and a device.
Countries "approving" bitcoin just makes it actually legal to use and accept for merchants. correct me if I'm wrong
I think that's just the half of the truth. Merchants and traders need a stable currency and crypto isn't stable so the can't use it. What is the point if you buy an apple for 1
BTC and tomorrow sell it for 0.5
BTC etc. (these are some seriously expensive apples that I'm talking about here

)? If a country legalizes crypto then more people will accept it as a payment method and use it and the prices will then stabilize. Something like that.