I'm using (self-hosted) Nextcloud News, what would your... service? Tool? Product? ... offer beyond what NN does? It is quite simple as well, offers an uncluttered interface, keeps my subscriptions as private as RSS subscriptions can be. I suspect you're targeting a different market from the one catered by self-hosted services like Nextcloud?

I am not familiar with Nextcloud News. In the first version, it probably won't offer much for you, besides having a catalog of feeds, the ability to search them, and subscribe with one click, which is usually not offered by non-cloud RSS readers.

For people who do not want to use self-hosted services (which generally includes me), it offers simplicity. Open the page, choose Google as auth provider, confirm, and you will get a friendly start page. Click on 'follow' on one of the feeds, and you can start reading immediately. The UI is more like Facebook or X, so basically, you just need to scroll. Either in a feed of your choice, or all your feeds. It's designed to work well on small mobile screens, tablets, and desktops, with great keyboard support on the latter. Larger screens use two or three columns.