Thank you very much. That is very helpful to know. One question I have still though. When I click and drag a synced folder from Google Drive to OneDrive (both inside the odrive folder), there is a blue checkmark on the folder itself. After I drag the folder, I can immediately select “unsync”. I haven’t tested this, but it sounds to me like the macOS Finder doesn’t refresh the folders’ synced property fast enough, because IMO the new synced state should be the pink syncing indicator.
I do have a bunch of this type of folder now that may or may not fully have been synced to the cloud, and I’m wondering if I can unsync these safely? The way I expect this to work in this case, and according to your explanation, is that it would throw me some kind of error and wouldn’t let me unsync the folder. That’s correct?