Most of the time indie games actually do run on Linux, it's the games from big studios that don't (in my experience)

Most off-the-shelf game engines these days have been well tested with Proton.

Luckily most of the small inde games always support Linux. Most of those devs don't have a need or time to go out of their way to botch the support.

True. But small developers should support community owned things, as they are on their side. It's not profitable in spreadsheet, but healthy for whole ecosystem.

Remember Windows creators are the ones having a dream for everything being on XBox and Microsoft Store.