Of course, a lot of people used to have doubts about cryptocurrency, as it was a completely new type of financial asset that was not like the previous ones. Most importantly, everyone was accustomed to the fact that money was always issued by states and at first they did not believe in the power of private and "no one's" money.
This was partly motivated by government officials. So, in Russia they refer to the article of the Constitution, which says that the only legal tender on the territory of the state can only be the ruble.
Also, one of the main reasons for the refusal of states to recognize the cryptocurrency is the impossibility of state control over it in terms of the movement of cash flows.