HiPhish: They want to do the Valve and force their own store down people's throats. Keep in mind that not everyone knows about GOG and so getting people to sign up will introduce them to it. Steam would not have become so powerful if it was optional.
Of course that's like saying the mafia would not have gotten so powerful if they didn't use violence against anyone in their way. All I can do is vote with my wallet until patches become freely available.
jamyskis: I don't think they've had much of a choice to be honest. GOG have spent the past six years trying to play it nice, adopting a policy of "inviting" gamers to try GOG without trying to force them in. It hasn't worked, and they have been consistently steamrollered by Valve's aggressive expansion policy through games being released with enforced Steam use at retail, enforced Steam use at most distributors.
Fact is that if GOG don't act more aggressively to push their store, all that will happen is that gamers will continue to be lazy dickheads and refuse to use anything but Steam, rationalising their laziness with excuses such as "I want it all in one place", which in turn means that everything available for PC will be Steam only with a possible delayed GOG release as an afterthought.
That's why we're seeing the NVIDIA promo deal with the GOG code for Witcher 3, that's why the retail version is using GOG for patches and DLC, that's why Galaxy exists in the first place. Valve got to where they are now not by offering a superior service, but rather by taking a killer app (Half-Life 2) and using that along with extreme price markdowns to gradually gain a stranglehold over the PC market.
The only way that stranglehold can be broken is by using similarly dirty tactics. Do I like it? No. Would I prefer a fully DRM-free version at retail? Yes.
But I'll tell you this - the solution may not be ideal, but it's a thousand times better than being lumped with a Steam, UPlay or Origin version on disc.
Such a passionate write up,rep for you sir.