It sounds simple on the surface. You copy a link on a site into a feed reader app. Then whenever that site updates you get a nice readable article on the app.
But that sounds like something that could be accomplished locally. Why does every RSS reader I run into require an account or otherwise rely on the cloud?
Lot’s of mention of syncing settings, but the other reason for a server is scraping sites that do not provide their own RSS in order to create feeds. That requires regularly checking pages and translating new content into a standard RSS format.