Yup, but there’s no DRM to lock you out a few years down the road when the DRM servers go down, and you don’t need to login to their service to play your games.
Yes, the license has restrictions and Steam has been a good actor so far, but you don’t have to look far to see how they could flip (see Sony revoking Discover video purchases, which they have since postponed). GOG wouldn’t be able to do that since they have no mechanism to remove things you have already downloaded, they can merely revoke future access to it.