[root_axis]

It's because the user on a website is understood to be representing themselves, not the organization that created the website. The intent of section 230 was to codify this distinction in representation into the law.

On the other hand, a print magazine hires employees to produce a bespoke product sold to the public, so whatever they publish in the magazine is understood to be a representation of the magazine company. In fact, the owner of a website would indeed be liable for posting infringing content if it were understood that the site owner was representing themselves (e.g. if I posted stolen photos from your laptop onto my self-hosted blog).