No government never want something in their country which they cannot control and which can be affect their country economy or financial markets. Cryptocurrency are decentralised nature is the main point of view around this topic. Another thing is its untraceable and uninterrupted money transaction facility. This facility attracts many anti social people to use this kind of money transaction medium for their various crime purposes like kidnapping, cyber attack, malware attack etc. So it is another reason behind this topic. Another thing is its volatility which affects an country share market.