For the 500 millionth time Section 230 does not say "censorship makes you a publisher". It says the exact opposite. An information service cannot be held liable for:

"any action voluntarily taken in good faith to restrict access to or availability of material that the provider or user considers to be obscene, lewd, lascivious, filthy, excessively violent, harassing, or otherwise objectionable, whether or not such material is constitutionally protected"

Translation: they can "censor" or moderate or remove spam to their heart's content, even beyond what's legally required.