Little free digital libraries if you like. It’d be possible to do once the DRM is gone, if only there was a platform that made selling without the locks a major part of the pitch…

Functionally though it is possible, ebook lending exists already, but from what I gather proper libraries pay some sizable fee for the right to do so. There’s no reason other digital media couldn’t do the same.

You think the company doesn’t have the ability to curate the notes allowed by the community or to farm their own? It’s always possible for a site owner to shape the messages on the site, even if it comes to a point of direct database manipulation.