state wants to get tax. the input and output of the money can not be controlled. also a serious competitor for bankers. also a good way to make money. countries are opposed to it. a money they can not control is troubling governments.
The fact that they are simply going to be losing that control which they are so much used to is enough to scare them into looking for ways to block the idea of cryptocurrency coming into play in the country, but this is not like they have any choice since a lot of it cannot be controlled anyway and they will simply end up missing out in the long run which I believe a lot of countries like this will end up coming around.
Governments have been used to centralization, and seeing the opposite want to take the day, that is something we all know it would be hard for them to accept at once.