* Miniflux is great. It's the closest to what we'd like.
* It is self-hosted and Open Source. Ours is not.
* It uses more JS than we do. And JS is required, I think (it's not in weloverss).
* Miniflux currently has more features than we do.
As for the business model. For now it's completely free because we just want to gauge interest. But the idea is to add a subscription fee in the future. We really don't like ads, so that seems to be our only good option.