This is something to ask the Terraria development team. Chances are cloud saves will not be included because Gog Games are DRM free, so the only way to have cloud saves would be through GoG Galaxy, which partly ruins the point of DRM free.

I use GOG Galaxy, I have no problem with that but cloud save is still not implemented here for some reason. I don't see the incompatibility of using a DRM free platform and having cloud saves. I have lots of games in GOG that support this feature.

The incompatibility of DRM free and having a sign in to use certain features is inherently incompatible imo. I'm not saying cloud saves are wrong, in fact they work fine on GoG if you ok with being signed into a service.

But at the end of the day it's on Terraria developers to implement it and not GoG.

My request was targeted to the devs. I know GOG can't do anything regarding this matter.. I also asked over at Re Logic's forum many months ago just to make sure they got the request.

The devs are basically not present on this forum at all, there's as close to a 0% chance of them seeing this thread as you can get.