We all know, there are 2 types of cryptocurrency
1st: centralized
2nd: decentralized
The difference between them, centralized cryptocurrency is controlled by a government or a company. It has value only in the specific area under company or government boundaries.
Decentralized cryptocurrency has no connection with any state, government
But, the government of some countries are against Bitcoin and some are ready to adopt Bitcoin. So what would effect on Bitcoin if any government approved Bitcoin as a legal tender?
Whether or not the government approve Bitcoin as a legal tender it does not matter because of the fact that Bitcoin is a decentralized asset. It's just that they will regulate exchanges to counter the so called money laundering thing and also Bitcoin used in any illegal activities. But even though they has strong implementation of law against Bitcoin or cryptos I don't think they can control it totally.