Should conventional printing press owners be considered utilities because you might want to post a bunch of posters somewhere, and by refusing to print your posters they censor you?
The difference in the printing press analogy is that if a printing company won't print my poster, I can take it elsewhere.
You don't lose those for being too successful.
That isn't true for internet content providers due to section 230.
If internet publishers make active editorial decisions, they are also liable. Consider the new york times online.
I gave an example elsewhere that the owner of a physical bulletin board wouldn't be liable for posters on it, even if they occasionally came by and took down ones that they felt should be removed (for any reason).
Section 230 claims that internet sites are more like a physical bulletin board then a newspaper, in that they are remove-later, not review-first models. Aa such they deserve the same liability as physical remove-later systems: relatively few.