I think the reason why other ban crypto because crypto is a new currency, unstable, highly fraudulent and has not reached a certain balance like some other markets such as stock, gold .... Governments have not recognized crypto to protect people against scam risks. Once crypto is more transparent and stable, I think it will be recognized and become more popular.
It has a point. It is probably the main reason, the government worries abouth the cryptocurrency market itself. But then it is not only the problem but also the government sees the cryptocurrency as a tool in doing illegal things. Ae should clear that cryptocurrency is not for bad things but rather it is a tool to boost the economy.
Government want to apply tax on every item but they're unable to apply on bitcoins. The last reason is its anonymous and not traceable we can't reach to that person who is sending money.