Because until now bitcoin creator still unknown maybe they still have possibility the government create a bitcoin but the question is what country?
Because some of the government want to ban bitcoin to their country maybe they did not know that government of other country who create bitcoin. But all of that is still a big question and until now No answer until we find out the real Satoshi Nakamoto.
For the future it is possible for the government to issue a more regulatory-friendly crypto currency, because the government has an interest in using crypto to monitor it so it is not a place for money laundering or terrorist funding.
Although I personally do not believe terrorists use crypto money, protecting is certainly better than allowing it. So, the government in a country I am sure will someday issue crypto money.