The platforms themselves are an established authority. Giving them power over what the media and politicians can say should be recognised as a real transfer of power. Objecting to such a concentration of power in the hands of three unelected American tech companies (Google, Twitter, and Facebook) who have billions of users and whose products cannot be avoided without significant difficulty is not exclusively right wing and has nothing to do with tyranny of the majority.
Weren’t newspapers and major TV networks in the same position of unelected power as recently as a decade ago?
There has never been “unbiased” media in the USA. Even PBS, NPR, and in other countries the CBC and BBC have been (often quite rightly) accused of bias.
I’m not sure what the ultimate answer to “fair public discourse” is, but “government regulated media” surely isn’t the answer we want.
Yes, the media were and are in a similar position of power, and despite some bumps in the road they've turned out to be a very good thing.
I don't object to a good-faith defense of Twitter etc. as arbiters of truth, because it's entirely possible they'll do a good job and become a responsible authority. I do object to the idea that only the political right would have a problem with them, and that the only problem anyone could have is tyranny of the majority. I'm more worried about tyranny of Jack Dorsey than tyranny of the majority.
