alt Hacker NewsThe difference is one of redressing a concrete dysfunction. Libraries or the local bookstore or whoever aren't trying to sneak into your home, onto your child's school bus, into your child's classroom, while pushing various extremist publications purely for their own profit (ie "engagement"). We do in fact have zoning laws - I can't inadvertently encounter a strip club in a quiet residential area. Meanwhile it's commonplace for children to carry a network terminal around with them with which one can readily access the equivalent of things far worse than that.
What I've described does not restrict one's ability to speak freely. It is most similar to an impressum except it bears no identifying mark thus poses no hazard to anonymous speech.
Impressums cannot be required in the US, once again thanks to that pesky First Amendment. You may be mixing us up with Germany.
Mandates on how speech must be structured are a violation of freedom of speech, Constitutionally speaking.
“Redressing a concrete dysfunction” does not appear in the Constitution as an exemption to guaranteed rights, as far as I am aware. The proper remedy for this kind of problem is an Amendment, assuming you can get enough people to agree with your assessment.