Well, Valve owns Steam, their publishing arm/store/DRM. And like EA now sells their games with their online store/DRM "Origin", Valve does the same with theirs, Steam!
Yeah, they get more by shoehorning people into Steam than they would lose from not selling DRM-free versions.
There may have been a point to stop this from growing into what it's become early on... But it's too far gone to be broken free of save a major scandal. And even then, it'd probably take a few. It's just by far and large a non-invasive tool. They've worked out many kinks.
I'm not saying it's perfect, nor am I saying we should be happy with it. But it's avoided the major problems most other DRM efforts see in "making things more difficult for legit users than pirates". I haven't had any issues with any aspects in years.
CD Projekt Red who own GOG naturally distribute their own games through GOG, but note that they as well distribute them through Steam. I see no clear reasons for Valve to restrict the distribution of their games to Steam only. Yes, historically it came with this not very invasive DRM, but there is still no reason to keep it forever, since DRM has no good reasons to be used altogether.
I understand that Valve can be already too involved with game producing companies which still have backwards thinking that DRM is a must. But Valve can start pushing them to drop it, instead of being passive.
Yeah, they get more by shoehorning people into Steam than they would lose from not selling DRM-free versions.
There may have been a point to stop this from growing into what it's become early on... But it's too far gone to be broken free of save a major scandal. And even then, it'd probably take a few. It's just by far and large a non-invasive tool. They've worked out many kinks.
I'm not saying it's perfect, nor am I saying we should be happy with it. But it's avoided the major problems most other DRM efforts see in "making things more difficult for legit users than pirates". I haven't had any issues with any aspects in years.