They eschew DRM for most or all of their games. They have gone out of their way to support Linux gamers with Proton. They used Linux as the base of SteamOS for their Steam Machines and then again with the Steam Deck. Now they're open-sourcing their audio SDK. They've even publicly stated that they if they ever go out of business, they will make sure you get to keep all your Steam games[0].
I feel a lot better about Steam as a dominant player than I would if pretty much any other company were the dominant player (Tim Sweeney, I'm looking at your and your anti-Linux diatribes).
[0] https://i.imgur.com/4sa1Ln6.jpg (sourced from https://www.reddit.com/r/Games/comments/18mzcn/i_asked_steam...)