The government doesn't have the power to ban the Bitcoin right now. Instead of the baning they are adapting to it and using its flow to their own benefit with the tax regulation. Some of the countries are banning exchanges to suppress Bitcoin transfers to the FIAT and opposite. With every exchange shut, people are getting angry and that doesn't benefit the government in every way. Bitcoin as the decentralized currency is slowly implementing itself into the society and the government cannot do absolutely anything because of that.