Apple uses algorithmic ranking by story, and pays news sites by article views. It is basically all spam. If you block the spam sites, their stories still show up in your feed with a note that you blocked the site.
Instead, they should let people structure their feeds by news organization, like podcast apps do. They should steer you back to reading the sources you’ve opted into, and mix in a bit of stories from related news organizations, not stories with high content similarity, or high “trending” scores.
(As far as I know, Apple News+ is the only product still operating in the paid news aggregator space, but if there’s another one, I’d love to hear about it.)