10 points
I appreciate what Valve does for Linux gaming, but GOG gives me the freedom to use the client I prefer (Heroic, GOG Galaxy, Minigalaxy, …) or no client at all. When I buy a game, I receive a ZIP file with everything I need to run the game, without requiring an account or an internet connection. GOG Galaxy may only be available as a Windows executable, but I run it on Linux, and they allow me to do so, no questions asked.