Earlier quoted context omitted.
The phone company analogy doesn't really work, because phone calls are by default private, between exactly two parties, usually just two people. If you look at the tech company equivalent of that, like FB messenger, or Hangouts, or other messaging systems, they behave more similarly to the phone company. It'd be difficult to get in trouble for something you said in a private message. If you want the analogy to make s…
I think you're correct -- a phone call is one-to-one and the internet is a broadcast medium. I believe radio (as in ham radio) actually has FCC rules regarding identification and profanity.
In particular, note that in the public resource analogy the regulation is quite neutral; legal censorship of profanity in the US is very narrow.