Nice one. As soon it comes out I take my money back. This is B.S on a new level. Never touch this developer team again.
If you pre-ordered from GoG.com, you are going to want to refund before the game releases. GoG's return policy does not allow for refunding games because you changed your mind, they only allow for refunds if you are having technical issues and after you have worked with them to try and fix the technical issues.
But they do have a refund policy for refunding pre-orders before the game releases.
Refund policies doesn't overwrite local legislation, so what he can do depends on that too.
That said I'm satisfied with GOG (in no small part due to their anti-DRM policies), so I will keep my purchase and continue to buy everything possible here. I will however be cautious in the future with this developer/publisher, so no purchase whatsoever if they keep on doing this crap. They can keep their exclusivity schemes on consoles.