I think the most common aspect why other countries keep banning cryptocurrency is due to the security measures. Many already become a victim of scams at many still doubting if there is someone who is manipulating the prices of cryptocurrency.
I think After crypto is more transparent and stable, I think it will be recognized and become more popular. I think the reason why the other ban is crypto because crypto is a new currency, is unstable, is very fraudulent and has not reached a certain balance like some other markets such as stocks, gold. The government has not recognized the crypto to protect people from the risk of a scam.