In case if someone miss, Steam version have custom maps. One of them is "WE Are Billions" (check billions reddit and lurk YT). How it be available for GOG version? GOG do not have same Community features (and even GOGmixes closed) at all, and not Workshop.
I think that weeks events still present.
Actually, i dont care about anything Workshop mods for any game in Steam. Even if it work as it must, i prefer old way (no "Subscription", but web links). That is only one map that i want to check, and i do not have that game - not in Steam too.

Maybe someone already buy GOG TaB? Or maybe devs look at here? As i can understand, they check only hidden sub-forums in Community Hub, and only some times.

Hmm... Week Survival events same as in Steam? Or separate?

There's the weekly challenge but I can't seem to find editor.

As i can see Launch_Editor.bat still in game files. Editor use same exe as game itself (started with ".exe" -editor or something like that).

I don't think it works. When I launch the game from the .bat nothing changes.

Please tell me I wasn't suckered into buying another game on GOG that I should have bought on Steam...

So, i think none of steamworks features are available (chekc other thread). At this time.