From yesterday's AMA on the Resident Evil subreddit:
https://www.reddit.com/r/residentevil/comments/1dsqsh6/comment/lba3sgn/
Maciej Golebiewski (VP Publishing at GoG):
"To be completely honest, GOG isn't doing much to proactively support Linux gamers at the moment. We have an affiliate deal with Heroic Game Launcher, an alternative open-source client for Epic, GOG, and Amazon Prime Games, but that's about it. You might say that Linux gamers are doing more for GOG than we do for them, considering some of them created the open-source GALAXY client "Minigalaxy".
Ultimately, we'd love to provide a better experience for Linux gamers as soon as we can afford it without diverting resources from our mission of Making Games Last Forever. Even within that mission, there's still a lot we feel we could do better. It might not be the answer you were looking for, but it's an honest one."
Most people are aware and already knew this, but... there you have it, straight from the horse's mouth again (and to be referred to whenever another one of those "Why does GoG hate Linux so much" threads pops up again).