I think some governments or states are banning bitcoin because they have some important reasons to protect their country or people. As we know bitcoin is a virtual currency that uses online and no physical form, so in transacting information about a person's personal data that can not be traced, it is used by criminals to act evil, such as making a dark transaction or fraud in cyberspace. In addition, the bitcoins that are shaped in cyberspace are often used by corruptors to launder money, in that way they are more difficult to detect by law enforcement officers so they can easily do so. There may be many reasons a government is blocking bitcoins that I have not thought of