How is GOG functionally different from Steam? They're still just a middle man. For actual DRM-free software, both GOG and Steam are nothing more than a convenience layer. If they're anything more than that, the software simply isn't DRM-free.
The whole reason for GOG existing was they strip dead DRM from old games so the work again without "warez scene" cracks; and fix all the OS/driver incompatibilities along the way.
As far as I know all the games you can buy on GOG will be completely DRM free.
