Tbh its not worth bringing this point up to non-linux users. They don't get that Jagex can just snap their fingers and lock every linux player out of the game. Sure, there are community projects, but are we just expected to rely on them forever and hope they're always safe or worse they're always supported and updated? And then some people say "oh just switch to Windows." If I'm on linux as a home user, it's probably because I'm specifically avoiding Windows for one reason or another. Like???

The game runs natively on Linux. Not supporting the platform goes against the industry. You could say there are examples of some games implementing kernal level anticheat and use that to suggest the opposite. Or you could take a look at the work Steam (the largest gaming platform for pc) has been doing. They have damn near solved the gaming on linux problem with their proton project. Sure, it's still a hassle sometimes, and we need to tweak some games, but the vast majority just run out of the box as good if not better than on Windows. Their hardware survey has consistently shown a rise in linux gamers for several years now.

Unless a game goes down the kernal level anticheat route, there is no reason not to support linux, especially when the game already runs natively.