If the same thing happened to any other system I guarantee you all your games would be lost. Even though Gabe has stated a while back that if Steam ever shutdown they'd come up with a solution to enable you to keep your games, I am certain he was only talking about Valve published games not any of the other ones that not only use Steam's DRM but some other third party variant.
GoG is the only place you could be certain that the games you bought are licenses you own. Steam games you rent or I believe the word they use is subscribed to. You don't buy a license to use the software you buy a subscription to play through steam, so if steam goes, they are completely without legal responsibility to provide a method for you to play the game without the steam service. Almost every other service is exactly the same in one way or another. Either you are dependent on them or if not on some activation server that might disappear in a few years with only some vague hope they will provide you a patch to run the game you bought without the activation server.
But my point is: GOG reputation is worse that it would have been if they didn't pull the pr stunt. The matter cannot be forgotten. Their choice, our trust.
The other point was in response to the fact that someone says that GrimRock drm-free standalone has less chance to be online in the future respect of gog. I was merely saying that it is not necessarily true.
So in the end the GrimRock preorder on GrimRock site seems better in anyway to the other. The only things you won't get is the game in your GOG account.
That's why I said that GOG should make an agreement similar to the one made with steam to give the game unlock when buying from the devs site.