Unless they've changed recently, I thought GOG's platform itself does not have DRM? Steam does provide DRM and doesn't tell you if a game uses it, though as far as I know there are generic tools to bypass it.
GOG also specifically advertises games that don't have DRM, e.g. [0]. Steam versions of the same game (e.g. Skyrim) often require Steam to be running and enforce mandatory updates that aren't always desirable with no rollback ability.
[0] https://www.gog.com/en/game/the_elder_scrolls_v_skyrim_anniv...
There are some games on GOG that still include DRM. The one I can remember offhand is Cult of the Lamb where the game would only run until a certain milestone at which the copy protection determined the GOG version was pirated and would gate the player from advancing. There were forum posts from the developer confirming this was intended.
Slightly off-topic, thanks for the reminder that I wanted to try Skyrim someday, seems like a good time to get prepped for it.
> Steam versions of the same game (e.g. Skyrim) often require Steam to be running and enforce mandatory updates that aren't always desirable with no rollback ability.
Yeah, but that's a developer choice. Steam doesn't force anyone to use their API for things like that. If that's a concern for someone as a gamer, they should probably support the companies that don't do it no matter the platform, not blame Steam for it.