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.
Yes they still not ready and not capable to track down all the money that goes into cryptocurrency and i believe it makes them hard to tax people. Yes and bank sure have a coporate with goverments so i think many goverments are think crypto still not ready for transaction and we cant deny the volatility is not good and it's changes every minutes. But seems like many country are starting to accept what cryptocurrency is and many company are starting to accept it for transaction and i do think soon or later crypto will be accerpted cause after all cryptocurrency do have a value and that means we could do a transaction using it.
Because they think that mostly criminals use cryptocurrency for illegal activities. There is no record of investment because it is decentralized and the governments have nothing to do with it. Anyone can easily put their money in crypto and can transfer anywhere he wants. This is the main reason that most of the countries do not allow the use of cryptocurrency.