yeah, i've added quite a few rss feeds and follow them, but there isnt really a fully dedicated RSS reader-type experience or curation, interface. I think it would make the most sense inside highlighter or something like highlighter that allows you to highlight and quote from articles and then share on to a social nostr feed.
best i've managed is turning the rss feeds into lists and they show up on amethyst.
but something like newsblur would be amazing.
also most people who use rss feeds subscribe to them and pay for eg free mode gives you liek 50 or something feeds, you have to subscribe for more. So could potentially be worth it for a dev trying to be profitable. No idea. there are a few on the market already as well as newsblur.