Even more tangential, I've been building an algorithmic digest of Mastodon (supports home, local, or federated) at https://fediview.com/. It might be interesting if you want a summary of Mastodon posts. Adding in RSS support might even be possible at some point.
One feature I would like to explore more is making algorithms completely customizable (as an advanced option perhaps). I.e. allowing changing all params manually in addition to being able to use your presets.
About the cutomizable params, it would be more complex since that means each person's articles need to have difference scores, which multiplies the storage and computation a lot. But on some level the priority of articles is customizable: you can provide customized "upvotes" for each of the articles in a customized RSS feed (an example to provide these fields in RSSHub: https://docs.rsshub.app/en/joinus/quick-start.html#submit-ne...), which will affect the final sorting of the articles.