The main reason I think is cryptocurrency still not legal in many countries so definitely they are banning the operation of BTC or any other Blockchain technology.
Some countries banned this currency and they can not accepting for their countries because they think that it will not good for banks and some are thoughts that it is harmful for our country but actually bitcoin is very helpful and beneficial currency for every country, if you see that those countries who accept this currency they are very developed countries and they don't think that bitcoin will harmful rather they are really like this currency.