I don't have Epic or Twitch accounts, but Gog works excellently -- there are several alternative clients (e.g. lutris) that let you install Windows games into a

I don't have Epic or Twitch accounts, but Gog works excellently -- there are several alternative clients (e.g. lutris) that let you install Windows games into a proton prefix through GOG with a nice gui. Plenty of GOG games are actually linux-native -- and they "just work" quite well, amazingly including lib / .so constraints -- they have a standard script that does quite a lot to fix this. If you don't want a nice gui, there are a ton of CLI downloaders that "just work" and save you clicking buttons a lot. GOG Galaxy for linux is "in progress" and has been for ~7 years. Alas despite being the most-requested item by far in their feature-request tracker, I think it's unlikely to happen soon. Galaxy itself works well inside a proton / wine environment, and will auto-update Windows games. Gaming on linux is great!