Deplatforming isn't the same as silencing. At no point in history before the 21st century did the average person think that they had a right to have their speech carried to the entire human race. We have a basic right to generally not be prevented from speaking, yes. (A right which does not extend to defamation, fraud, violent threats and other grossly harmful things) But have we ever had a basic human right to oblige any information channel of our choosing to carry our speech? Regardless of the import of our words? No.

And -- if I am similarly deplatformed for harmful speech, that's a good thing. Bad personal consequences are a just outcome of bad personal behavior, made more just if the same applies to everyone, friends and foes alike. It's an intrinsic aspect of the social contract.

As always, I invite people to look at Usenet as an example of what happens when a platform carries everything. People stopped going there because after the advent of bots, it was completely overrun with V1AGR4 ads. Try getting your speech heard when there's 99.999% noise to signal. It's silencing of a different sort.