Yeah, I mean this already happened right? This is what Parler was until they got shut down too. Which I think iis deeply troubling.
Let me be clear, I almost entirely agree with you. Free speech is absolutely essential to a functioning society and we should treat it very, very carefully. Social network bosses have for too much power to define acceptable speech and we already have a climate where controversial opinions are being policed out of existence (or at least driven underground as you say).
But there's a line that needs to be drawn between a difference of opinion and an outright, demonstrable lie. Lies aren't valuable. They don't serve the publc discourse or make us think. All they do is spread doubt and fear and hatred.
So then the question becomes; what do we do about them? I made a few suggestions here:
But I agree it's a very diffiicult problem. You may also very well be right about Trump winning the election of heh had been removed from Twitter earlier. But I'm not sure. I don't think his Twitter rants turned anybody off but those who were already never going to vote for him. But I do think it's likely that five more Americans would be alive today if his lies had been removed from the platform and challenged more effectively.