Ok, and how would doxing me be something that would further finding truth? That's not an example of a productive conversation limited because of anti-free speech.
> An example is cord clamping.
Nothing in your example is a conversation that couldn't be had on "anti-free speech" platforms.
What you've failed to give me is an example or description of communication that cannot be had on non-free speech platforms that isn't itself a turd.
Unless your doxxing example was to say "Hey, this researcher that lives on 123 maple street is where clamping came from and we clearly can't trust people from maple street because that's were bad people are from".
That, in and of itself, doesn't seem like a good way to go about discovering truth.