I don’t think you’re getting what I’m saying.
a. That’s no problem. On the contrary, I typically enjoy it.
b. Nevertheless, I was pleasantly surprised by the It’s Synced Before You Know It™ of GOG Galaxy as a concept.
The rest is called idle curiosity. It’s fun. Or I think so, anyway. 
But what does that have to do with anything? Why would you draw a parallel between ScummVM and GOG Galaxy/Steam/Broken Age? ScummVM supports setting a custom save path. This makes it extremely low effort to treat ScummVM saves however you please on just about any platform. (I understand Windows 10 does regular symlinks now, so this feature might be less useful than it used to be.) Broken Age by contrast does who knows what with some proprietary Dropbox API.
I severely doubt it. 