Agreed but there are several reasons why crypto is being banned.  Crypto is non taxable and there is a huge risk of money laundering through it , countries are taking some time to develop policies regarding it and they also needs to preserve their existing financial system. Keeping KYC mandatory actually eliminates the risk of money laundering to some extent.  
Exchanges now a days have some flaws, if investors gets an exchange which makes their trading easy and exciting, they will automatically go there.