I believe that the government are afraid of cryptocurrency because they don't have full control over it. They are afraid that those who are against the government can use it to mobile fund to cause a chaos. A classic example of it is when end SARS protests happened in Nigeria. Government place a ban on people's local account from receiving cash from the foreign sponsors to promote the protest. And people resort back to cryptocurrency as a source of receiving fund from the abroad. There is also prompt the government to place ban on cryptocurrency.I do understand that they do have a lot of concerns when it comes to crytpocurrncy and its adoption because it cannot be traced and therefore it can be used for illegal activities.