The bears eat it...
No, seriously... preparing and releasing games is certainly more work nowadays, with new releases this frequently. But that's one team,
"fix-old-games", web development (Galaxy) and legal are different teams.
My best guess it: They're preparing another big overhaul of the site, including reviews, wishlist and... the forum. All intregrated into Galaxy too. That alone would be a tremendous task, justifying months and years of radio silence.
I also suspect that they're understaffed in the engine room:
https://www.gog.com/work Which is not that surprising, because a lot of Polish talent is probably looking for greener pastures in the West, and who can blame them - apart from the wages being probably not that great, Poland is a very conservative country with has already been blamed for "democratic and state of law deficits" by he EU. I guess it's less bad in big cities like Warsaw which I expect to be more cosmopolitan, but in general I suppose it's a reason for young Polish talent to leave the country. And of course also a reason for foreigners to be reluctant about moving to Poland, apart from having to learn the language and logistics.
So I guess they have a large project, and not too many people to make it happen - it simply takes time. Rebuild of parts of the site from the ground up, we won't see any of it until it's done.