Another question - what burden does a Twitter ban impose on free speech on the Internet? If Twitter bans me, I am free to move to another social media site like Parler or even make my own blog. If my views are despicable enough then some services may refuse to host me but I am unaware of anyone who has been totally bereft of a solution to put up a website.
These alternatives fail to impress for one obvious reason. It's harder to get eyeballs on Joe's random Q blog than on Twitter or Facebook. Similarly I could self-publish a book - and people do - but I lack the expertise necessary to actually get anyone to read it. I personally see social media as a set of publishers rather than as a printing press, hence why I'm not too chagrined by this decision.