Every country has a different view of crypto, they won't apply the same regulation to crypto exchange. Just look at what China government did to bitcoin mining, no country follow it, right? Although China banned crypto mining activity, other countries allow it. So, it indicates that the policy of each government won't be the same. It is very doubtful that all countries ban crypto exchange as you said. Moreover, crypto is already an important part that contributes to world economic development. All countries should be aware to support it as all people demand it.