Hmm....
""We conclude that section 230 prohibits 'distributor' liability for Internet publications," said that ruling. "We further hold that section 230(c)(1) immunizes individual 'users' of interactive computer services, and that no practical or principled distinction can be drawn between active and passive use. Accordingly, we reverse the Court of Appeal's judgment."
"No practical or principled distinction"... how so? The Usenet woman specifically chose that piece to upload, so she is (in practice and in principle) publishing.
ISPs are protected on the grounds that they are effectively functioning as printers and/or distributors do in the paper-based world, controlling the medium rather than the message.
In the physical world, a white van man who delivers boxes of magazines to local newsagents doesn't have to read every one to look for infringing content. He doesn't even have to know the titles of the magazines for delivery.
No choice, no editorial control, no volition.
The Usenet case had volition. Maybe the woman should have won on other grounds, but she spread the content of the article of her own volition, so she was not a mere "distributor".