I agree with them banning Trump on Twitter/ FB if they think he is bad for their platform - because it is their platform. There is the "while under my roof" rules.
This of course highlights that the platforms we have populated are flawed by design to ever be vehicles for free speech or security of economy. This is a good awakening for a larger portion of the masses.
Except that it is illegal for commercial competitors to collude to ban or restrict supply to other commercial competitors (Trump is a commercial competitor in online advertising because he buys ads, as is Parler etc etc).
This is criminal, go to gaol, cartel conduct.
I understand this side of it. I think there are several more cases going up against this too. One of the problems with not owning the infrastructure of the internet, is it being commandeered on the second-layer.