bitcoin is banned in some countries because the government cannot control it, the government is too afraid if bitcoin has a bad impact on the economy and stability in its country. Another reason is that the government cannot apply taxes on bitcoin so there is no income for its government.
I think the government does not want to give their strength and control and that is the reason why the government wants to indirectly eliminate the use of cryptocurrency.
As we all know that a greedy government for control and crypto is something that takes power from a centralized authority and gives it to users.