From what I see, it is because governments today are already controlled by giant corporations in one way or another, in which they also get from the pool of thwie central banks, since they are paying large amount of taxes, they want tontake part of it, that's why we see politicians being endorsed by businessmen, theu aee the rwal ones that are pulling the strings, and since they cannot get control of bitciin they just forbid it, they are afraid their business will go down, since it is not a matter of political will, its just business and governments are also businesses.