Posted January 19, 2017
Ghorpm: I've just got an email from my friend with some more news. He warns me though that it's not a solid data but more like his own speculations based on incomplete information he was able to acquire... long story short it seems that some Linux games were optimized externally by Steam employees. And the decision makers are afraid that putting a Linux build on GOG may result in a lawsuit. My friend knows that it doesn't make much sense but he is afraid that his boss attitude may be "better safe than sorry". Sadly, he says he sees a lot of weird things like that in this company...
adamhm: I doubt that's really an issue as Valve haven't used such restrictive licensing before AFAIK - the last I heard they didn't even impose such restrictions on using the Source engine, but I can believe that some people responsible for arranging releases might be unsure about it & haven't bothered to actually look into it. I know for certain that it isn't the case with these games at least:
Metro Redux series - these not being here is partly GOG's decision due to issues they encountered (not sure what kind of issues though, as the Steam versions run great for me).
Saints Row series - these were ported by VP; when VP were asked about bringing them here their response was that they hadn't been asked to prepare any builds for GOG by Deep Silver. Given its current state on Steam I expect SR2 would get rejected (it's *still* missing a lot of audio and has some performance/graphics issues even taking into account the original poor quality of the Windows release - it actually runs better in Wine) but SR3 is mostly stable and its performance while not great is reasonable, especially when compared to Wine.
Dust: An Elysian Tail - a build was prepared & submitted to GOG a little over 4 months ago. It's been waiting on some "red tape" to be cleared ever since then; no idea what's currently holding it up.