You might not like my answer, but I haven’t really played new FPS games in years, because basically none of them are doing what I want. I’m well served in basically every other genre right now, but these things are cyclical. We’re just getting through the era of indie FPS games inspired by Doom/Quake and other more maze-like shooters, and we may soon be entering the era where FPS games are inspired by my favorites. My multiplayer these days is usually fighting games, and the only ones that will give you trouble on Linux are Dragon Ball FighterZ and the upcoming 2XKO, both due to anti cheat.

As an aside, I’ll also say that where you put your time shouldn’t matter, if the product is free, for instance, but it does matter in online video games. Your presence in matchmaking is adding value for someone else who might spend money in the game, so you’d still be helping the causes of CS2 and TF2 just by playing on the official servers. For TF2, I think the code just went open source and there’s a revitalization project to bring it back to what it was like at launch? If so, that might be pre-loot-box, and playing that version of the game would help send the message you want to send. The same might apply to old versions of Counter-Strike.