Recent testing revealed that Arch Linux, Pop!_OS, and even Nobara Linux, which is maintained by a single developer, all outstripped Windows for the performance crown on Windows-native games. The testing was run at the high-end of quality settings, and Valve's Proton was used to run Windows games on Linux.
Only because the publisher or developer specifically don’t want their games played on Linux. And it’s mostly because of anticheat
Yeah, same story like beeper and apple