I did Linux testing of games and for the platform. This was before valve did a lot in the Linux space. You know the game dust force? One of the reasons it works for Debian is because of something I reported. It's a bunch of very small contributions over a 4 year period. Humble bundle even had their own internal issue tracker. It was technically my first fortay into QA and Linux dev work. Linux native games are awesome.

Nowadays we have proton/wine/etc... (and that's awesome) but Linux native apps have many advantages over an emulated layer. Power savings and CPU cycles just a couple. I'm glad we have so many options for games. Gog or otherwise.