Cryptocurrency cannot be banned by the government because the system of cryptocurrency is not centralized, everyone has the right to have cryptocurrency coins. If the government banned cryptocurrency, it would have been done since the first time Bitcoin was born and the proof is that now Bitcoin is not banned, in fact Bitcoin has become a digital asset that is fought over. It also depends if a country bans cryptocurrency, then the country will definitely block all access to the cryptocurrency business, maybe some countries are banned but until now I don't know which countries have banned cryptocurrency.