The free-speech argument kind of loses its luster when you send something without your name attached.
Maybe you're not from the US, but the US has a legal tradition of strong protections for anonymous and pseudonymous speech. The Federalist Papers, which were a key part of the political discourse leading to the existence of the US, were published anonymously. So maybe what you say is true in Ukraine or China or Myanmar or wherever you're from, but it's certainly not true in the US.