jcoa: ...they seem to be one of those "Steam comes first" devs.
As well they should. I hate to see developers hoping to get a huge number of sales from GOG. The community just isn't big enough here, to guarantee the numbers. Every developer should release on STEAM first, debug their game, sell DLC, and a year later, release a proper DRM-Free build in the form of a complete edition, with sales expectations tempered by the context. Also every developers should consider releasing on Switch and Playstation, which still seems to guarantee a lot of sales.
Unfortunately, considering Thronebreaker's release, not even CD Projekt seems to realize this.