doomicle: I really don't see a DRM future as being possible for GOG. One way or another they're going to have to start selling DRM games if they want to keep releasing new games with multiplayer functionality. Otherwise they'll have to stick with the real good old games, (pre-online validation) which didn't have multiplayer DRM.
Or disable multiplayer, as they've done before (Brutal Legend, Full Spectrum Warrior and probably many others).
I'll give you an even better target for your misdirected anger: Humble Bundle. Recently they sold a supposedly DRM-free Android game bundle, while some of the games in the bundle were actually just codes you activate on GooglePlay with your Google account. We are not talking about multiplayer here either, but single-player games. Burn them at stake, right?
I'm fine with the suggestion that GOG would elaborate that only single-player is guaranteed to be DRM-free, and online gaming may need an account (I think they have mentioned this on some game cards, if some features (leaderboards or multiplayer) need an account somewhere). I'm a pragmatic person so I'm fine with the multiplayer part needing some kind of online validation since that is something that can clearly benefit me as a customer as well, in the form of cheater control etc. With single-player games, I can't think of any benefits to me for the game requiring online validation.
Also the fact that unless I am able to set up a server myself, the multiplayer part will become defunct anyway if either the plug is pulled from the official multiplayer servers (hello EA!), or no one else cares to play the game anymore besides me. The single-player part is unaffected by such things, which is why I care about the DRM-freeness of the single-player only.
doomicle: Therefore GOG versions have only superficial "DRM free" differences from the Steam version, as there are often easy workarounds for Steam as DRM, and no workarounds for the CD-Key check DRM on the multiplayer server.
The main difference to me is that the GOG single-player games are supported as such as well. If I have issues trying to run Steam games which were supposed to be DRM-free (like the DLCs for Crusader Kings 2), Valve nor the publisher will help me because they never promised I should be able to run the game without the client.
It was just some guy on the internet who claimed so, but i don't think that guy will refund anyone their money either.
Also if you "install" (move) such a game to another PC in order to play it there without the Steam client, and that game adds registry entries and such when you run it the first time, how do you "uninstall" such a game so that those registry entries are also removed? With GOG I know: by running the uninstall from the Control Panel, just like with any normal program.
To you the difference between a DRM-free game on GOG and Steam may seem minuscule, but to me the official support for being able to install, run and uninstall the single-player game DRM-free is an important benefit.