Comment by flkiwi

There's an important US Supreme Court case from 1964 (NYT v. Sullivan) that indirectly addresses this, noting that defamation claims by public figures against a news publication are subject to a heightened standard (and, conversely, that defamation claims against non-public individuals are not). If the NYT engaged in defamatory activities against a general member of the public, that member of the public could sue and have the same chance, in principle, of winning against the NYT as it would against anyone else.

The odd part about this debate is that platform companies very, very often have contract provisions prohibiting dangerous and even merely objectionable activities that could harm the reputation of the platform (or damage it or its customers). Platform companies having the power to yank controversial content isn't new.