

Because properly packaging/distributing your game is hard. Maintaining a build environment, running tests, having unique deliverables, it all adds effort. With Proton specifically, it’s a much lower effort to report. If there is a linux specific bug, it’s fine, because Linux isn’t officially supported, it’s just known to work with Proton. You also only need to ship one binary file (the Windows build), so you don’t have to adjust or alter any processes.
This may not be the reason they do it, but there are real reasons.





You’ll have to ask them. Maybe you should, and maybe they’ll consider it. If you don’t ask, it’s much less likely they’ll think of it themselves.