

Gog sells native Linux Games, and the heroic games launcher is part of their partner program. Gog games run perfectly fine with wine/Proton and are the preferred way to play games on winlator.
The gog galaxy client might not be on Linux but that doesn’t even matter since heroic does everything galaxy does but better





Gog literally won’t allow you to sell a game if it has DRM, that’s their whole deal as a Platform.
Also having the installers means that if you can install the game files, set whatever environment variables the game needs, create the necessary folders, install the redistributable runtimes the game needs to run,and link the dlls properly. If you only have the game files you have to manage all of that yourself