mayuro: I disagree with the previous replies.
The GOG version of Manor Lords ships with libraries for each of the three online services:
260K 3. Mai 19:27 Engine/Binaries/ThirdParty/Steamworks/Steamv151/Win64/steam_api64.dll
22M 3. Mai 19:27 ManorLords/Binaries/Win64/EOSSDK-Win64-Shipping.dll
14M 3. Mai 19:29 ManorLords/Plugins/OnlineSubsystemGOG/Source/ThirdParty/GalaxySDK/Libraries/Galaxy64.dll
But the game runs fine offline with all these libraries removed. Of course you will need the GOG dll to use Galaxy :)
I have not analyzed whether the game would actually connect to EOS or Steam in the GOG version. My *assumption* is that it is only to simplify releases and not to connect to multiple services in parallel.
Thanks for having a look at this. I'll keep watching the thread. I never received anything back from GOG or the dev about it, so shrug.