A Microsoft file hosting and synchronization service.
Following up on this, as I've recently obtained a new machine running Monterey.
I'm dangerously close to filling my OneDrive for Business capacity at 935GB of 1024GB.
I downloaded the OneDrive app, and it immediately began syncing the entire OneDrive (935GB!) without asking what specifically I'd like to sync. After about 15 minutes, everything has been synced to the machine with Files on Demand feature enabled.
Looking at the System Information screen from Manage Storage, I can see that the On Demand files are no longer registering in the Manage Storage area.
So, the issue we were dealing with back on page 7ish seems to have been resolved from what I can tell.
I'm still angry that I had to sync 100,000s of 0k files before being able to tell the application to not sync those folders! An issue for another ticket.