Now, many countries around the world are starting to adopt Bitcoin as a legal tender, but many are also against it. A further concern for Bitcoin users is that Bitcoin becomes more controlled if a country can hold the 51% of Bitcoin currently circulating in the market, but achieving that in my opinion is difficult because Bitcoin mining revenue is always halved every 4 years. I think Bitcoin will remain decentralized even though many parties want to control Bitcoin but it will be in vain. Whereas Bitcoin cannot replace fiat because fiat is protected by the regulations of each country so it is impossible for fiat to be replaced by Bitcoin.