I agree that free speech is free speech, the private org that runs the platform has a veto, the assumption that these platforms are the equivilant of stepping into the street to stand on a box is a not realistic.
Even HN is only quasi-free speech, there are rules that will get one censored.
If you love freedom, there are mailing lists and other platforms but they arnt as high on dopamine and the audience gets a little bit more sketch.
Even the US never had free speech—there was always stuff you could/can say to get you gagged by the courts or thrown in prison. Your freedoms always stop at impacting other people.
Somehow we jut gave business owners more freedoms than we gave everyone else....