> Besides, the gaming industry keeps shooting themselves in the foot by only supporting Windows (Mac is a thing too). That is slowly changing, but so many game devs are drinking the Microsoft koolaid they don't even consider using another graphics API other than DirectX. Many other decisions like that as well.

The gaming industry is thoroughly multi-platform, and many games that are limited to Windows on general-purpose PCs aren't so because the require DirectX, since they've also been developed for Playstation where DirectX isn't a thing.

Support for Mac can be somewhat challenging, partly because the platform (including the hardware) is so different from other general-purpose PCs, and partly because Apple doesn't particularly care about backwards compatibility, and will happily break applications if it suits their interest.

However, a developer that doesn't support Linux does so because they don't want to for whatever reason, not because the technical bar is too high. With the work that has gone into Wine, Proton, and other Windows compatibility libraries these days, there's a good chance that a Windows game will "just work" unless the developer does something to actively inhibit it.