I see it now, first force you to use a Microsoft account to sign into your computer, then push the limited storage OneDrive sync as a 'safety'-'backup feature', bonus points for using fear of file loss. Third, once it syncs and there isn't enough space, because of course there isn't, then you push a storage upgrade subscription, and have badges appear all over the whole OS pushing the upsell.
Perpetual revenue stream from your OS install base.
Revise the UX so that anywhere the user chooses an option like "Save As.." they are initially presented with the involuntary OneDrive option(s) and then they are forced to click-through several times to get to the option that will allow saving to local storage.
Perpetual revenue stream from your OS install base.