I built a site that's similar in concept to Hacker News, but is entirely fed by RSS feed content, that is then bullet-pointed summarized on the article page: https://engineered.at/

But I also extract topics automatically from the content too with LLMs, to allow for dynamic topic pages that users can separately subscribe to to tune their feeds.

Haven't promoted it much, but it's pretty amazing what you can do for a couple bucks a month. And my main thesis with this site is that by locking the content to only rss feeds of known blogs, you dramatically reduce the spam submission risk (basically eliminate it). Doesn't handle the spam comment side of things, but that's a different problem.

EDIT: I also open sourced a Rails engine I made to power this site if anyone is interested: https://github.com/dchuk/source_monitor