You can't ban cryptocurrencies or anything that use more than one server... Even if you manage to filter cryptocurrency related traffic at ISP level, it still won't help much if the traffic gets encrypted and tunneled using random ports.

Throughout history of internet, governments and ISPs have tried blocking access to certain services by limiting traffic by IP addresses, hostnames or TCP/UDP ports... It has not taken long before the services have been fully accessible again.

It's the same thing with GDPR, AML and KYC... When you put too much restrictions, eventually you start violating existing rules and eventually lock yourself out of something you are trying others to block out... For example, a lot of WHOIS entries are invalid and domain registrars face dilemma of either complying with GDPR or forcing a lot of domains offline due to requirement of information about domain owners and administrative contacts be either public or private information depending on which rule to follow.