No, my metric is what am I getting for the money?. on Steam I get the game and some niceties, plus I'm directly financing the game development and indirectly financing wine/proton/FEX. On GoG I get the game and I'm directly financing the game development and nothing more.

Buying the game directly from the game dev I'm financing game development and nothing more exactly like GoG but the dev gets 100% of my money, if the game is doing things very right (like the 3 I mentioned) that's my preferred form, especially because Valve gives developers extra keys for them to sell as long as they don't sell them cheaper than on Steam, so I can have my cake and eat it too. Although to be honest most of the time I just buy on steam because I'm a lazy fuck. But for example, Project Zomboid I bought directly from the devs before Steam came to Linux, exactly because it had a Linux version.

Which reminds me of something, you probably started using Linux recently, some of your comments mention GoG Galaxy on Windows, and that only came out in 2014, so I must assume you migrated after that. Depending on when, you probably haven't been around long enough to feel the impact Valve is having. So while in relative terms to their profit they might not be doing that much, in absolute terms they're definitely doing more than every other player combined at least 10 times over. And I'm not naive in thinking that they're doing it out of the kindness of their heart, but the improvements are real, and even if they do a 180 and completely shit on Linux their improvements are here to stay and I can vote with my wallet then.