You talk as if all Steam games use Steam DRM. No, it's not GOG but it's not the same category as Sony and Microsoft at all. It's starting to sound disingenuous when I see Steam lumped together with them.
I think it's a fair comparison. Steam can change their behavior to become much more user hostile at any point, and hold our triple digit steam libraries hostage.
Also the steam DRM on a lot of single player games can be removed very easily. https://github.com/atom0s/Steamless
and is a recommended step for engine modding games like skyrim.
Until Steam starts telling me before I buy which games have their DRM and which doesn't, they belong in the same category as Sony and Microsoft.