But there are also other requirements in section 201 for a "covered platform", which advertising-funded sites that aren't "social media" most likely don't meet. For example, a typical personal blog, even if it shows ads, doesn't meet subsection (C), because its primary purpose is not to share user-generated content (e.g., comments by readers)--it's to share the blog author's content.

(HN itself doesn't meet at least one other requirement besides subsection (E): subsection (D), "Uses a design feature to promote user engagement on the platform".)