Bitcoin is banned in some countries for the simple reason that their governments view Bitcoin as a threat to their power. If a government controls the banks, the banks control the cash, the ATMs, they know where each bank transfer goes, it is a way of controlling the population, money, it is also the oldest form of control, along with fear. Bitcoin would take away all that power quickly. Bitcoin and crypto remove those forms of control, which is why some governments are against Bitcoin and ban it.