On top of that, the United States has never had "free speech without limits." Or any rights without limits. A core tenet of at least one political ideology in the United States is the idea that one's rights only extend as far as another's unharmed state of existence. i.e.
https://quoteinvestigator.com/2011/10/15/liberty-fist-nose/Such limitations in the case of the first amendment are pretty well captured here: https://en.wikipedia.org/wiki/United_States_free_speech_exce...
Credible threats of violence and incitement register with exceptionally strong precedent. Fighting words and threatening the President-Elect of the United States are two such categories of unprotected speech with, again, exceptionally strong precedent.
Anyone claiming their freedom of speech is being violated in this scenario by pushing fighting words and specific threats may be failing to understand:
1. that such freedoms don't extend as protection from being barred by private property and enterprise, and
2. that even if they did, their words are exempt... again, with strong law and case law.
I do agree that there's value in exploring registering social media and communications platforms as utilities. I don't yet know the implications of such.
And on another note (and borrowing from an earlier comment of mine), I do wonder how many of the Parler removals that have taken place used Wednesday as the justification but in reality were done for FOSTA/SESTA cover, which ironically is a law passed within the last few years.