People here like to pretend google wasn't evil from the start.
https://qz.com/1145669/googles-true-origin-partly-lies-in-ci...
But you are right there is always the possibility they turn to shit. The advantage is that compared to other DRMs it is trivial to break even by yourself and all steam games are already freely available cracked so if they do just torrent them.
There is no way for Steam to enable DRM on a copy of a game you made after you downloaded it from Steam. It's a weird argument to use really - once you copied the data elsewhere neither platform can do anything with it.
In the first case they can just refuse to let you use your copy when you ask for permission.
If the game didn't have DRM enabled, no check is made. Copy the game folder elsewhere, without steam install and it should launch.
Devs can enable the DRM afterward, but your copy won't be locked.
But even then, if valve goes bad guy, the DRM is simple enough to be broken, and there is no double check or something preventing you from playing (unlike Denuvo which encrypts the game and has multiple separate checks for the DRM).
So if one day Steam (more broadly, Valve) says "nope" you're locked out of your game, correct?
With Valve, I'm more concerned of not being able to download the games if they go under, than the DRM on the games I have. Over time, the Steam DRM has also been more permissive than before, as I can now play my "family's" games and they can play mine.
https://www.gog.com/forum/general/how_to_run_steam_games_off...
I'm personally concerned about what happens when Gabe retires or shuffles off this mortal coil, and his replacement comes with a "fresh" revenue idea. He's a one of a kind visionary leader, it's not a sure thing that his successor is the same. I've been baited and switched so many times in the past few decades that it's hard to blindly trust any company for more than the very immediate future.
From the couple documentaries I have seen over the years it already seems like he is basically retired, only working on things he is interested in like the brain interface stuff. I think as long as valve stays a private company the enshitification will be limited.
On the other hand, if the games already have DRM and it gets worse or for whatever reason Valve goes under and you can't play your games anymore, well... you can't play any DRMed game without using whatever DRM mechanism they'll choose next.
In other words "No DRM -> DRM" and "DRM -> Worse DRM" have different outcomes.
> Valve has been doing business this way forever.
And Google's motto was "Don't be evil" and for a good chunk of their life they weren't. That worked out well, did it? I'm not saying Valve will do a 180 and squander all the good faith it acquired. I'm just saying it's not beyond the realm of possibility.