Any legitimate economic activity that generates work and value contributes to a country. Bitcoin has opened up competition in certain financial fields and established new use cases which could not have been done before.
What do you think is the major issue or reason here?
The reason for bans are simple. One is direct control, and second is the fear of competition towards their own crappy currencies. If you have a really good currency or asset, there is no reason to fear competition. However, if you have something really fragile or bad which retains only its status quo through bans and manipulation then obviously Bitcoin is a big issue to such things!