They can't ban all web clients and all relays. They can use local clients on their devices or download clients from anyone on the Internet. Relays can pop-up and be spun up around the world. And they can also use TOR.

You could use TOR, or a VPN (one with depois packet inspection resistance features in case VPN's get blocked too) or simply connect to relays that aren't blocked

For the clients you can install from alternative app stores (if you use Android, not sure how that would work on IOS), install with APK or get the code to compile and install manually (more complex but still possible)

It's not about banning! It's about making it illegal and fining/jailing you! That's the game. They are not gonna ban anything. They are gonna jail a few and scare everyone else into submission.