This impacts more than just cheaters. Rockstar apparently didn't enable Proton support with Battleye meaning many Linux users can no longer play GTA Online. I don't play GTAO but I am not looking forward to when I can no longer play Red Dead Online.
"As we mentioned previously, BattlEye on Proton integration has reached a point where all a developer needs to do is reach out BattlEye to enable it for their title. No additional work is required by the developer besides that communication." source: https://store.steampowered.com/news/group/4145017/view/3104663180636096966