All those free speech discussions regarding big tech are meaningless.
Jack Dorsey and Zuckerberg are basically the Tyler of Twitter and facebook, they can do whatever they want with your account and user data. It's their property.
The only thing that keeps them in check are privacy, discrimination and racism laws (i.e. they can't ban you for being religious, disabled or having a certain skin color) and their shareholders because a mass banning event is probably bad for business.
In 2016 the GOP and Trump campaign were the biggest spenders on Twitter and facebook, in 2020 they weren't and they actively promoted alternative platforms.
There's the reason why big tech dropped support for the "conservatives". These people have banked in on ISIS beheadings, anti-vaxx, Maidan, Tahrir etc. and everything in between.
They have no morals but they need to suck up to the winners of the power struggle and get on the 'good side' before the investigations and lawsuits begin.
And why would Twitter keep those conservatives on there if all they post is : "Move to Parler duurrp"