This only finds things that are in some kind of RSS or Atom feed, but inoreader (with a Professional account) can keyword-search every public article that they

This only finds things that are in some kind of RSS or Atom feed, but inoreader (with a Professional account) can keyword-search every public article that they have in their index. It doesn't return results quickly, and there is often blogspam, but it does find interesting things as well. A screenshot of the search options: https://i.imgur.com/fIzl2cp.png https://i.imgur.com/fIzl2cp.png