It would be nice if GOG hosted one or two large worlds, one could be reset every week or so and the other every month or as needed, even if they were bog standard worlds with no mods or anything fancy etc. I think it would be well worth it compared to the cost and effort especially at a time like this where a game is getting renewed interest. Infact could say that about a number of games sold on GOG, though Terraria is a good example.
They could even add it as a feature of Galaxy, being able to join a GOG server to play with others who bought the game through GOG. Though personally I'd prefer if it wasn't limited to Galaxy users especially with games where there might not be enough GOG Galaxy users seeking a server to amount to a meaningful population for said game, still being a company it would be understandable for them to use it as a way to increase adoption of Galaxy by limiting it to GOG-Galaxy users.