Steam also offers DRM-free games, and they don't hide them behind a closed installer. I don't like installers since they're yet another moving part that can break, e.g. an installer built for windows 95 might not work even though if you were to extract the game binary from it it would work, so having an installer could make a game less compatible.

The ideal form of distributing games is compressed folders, I recognize this is less user friendly, but it is the format that most preservation effort uses (e.g. zip of a ROM, instead of an installer that installs the emulator+ROM like what GOG is doing).

I'm also not shitting on GOG, I believe they're a good company, although I'm not their target audience since they refuse to sell me games I can play on my Linux machine. I'm all in favor of DRM-free and wished they would be more strict about it, that could convince me to buy some stuff from them. I did bought games from them in the past until I grew tired of almost no game having Linux compatibility and them not offering an official client, plus I noticed that some games had DRM and that was the last straw for me, because of I'm going to be buying maybe DRM-d games, might as well do it while giving money to a company that cares about my use-case.

I think GOG should be praised for some of what they do, particularly by their anti-DRM stance (even though they're not 100% behind it). But what annoys me is that people seem to praise them as if they were doing this amazing work that no one else is doing, when most of the stuff people get overly excited about is just a marketing move and Steam is usually doing much better work in that regard, but is usually cited as the bad guys by the people who drank the GOG Kool-aid.