Google recently turned off my gmail because my google drive quota was exceeded. They were "protecting" me from myself, by denying me the ability to buy more storage. They refuse to accept any payment method until I deliver a passport photo to them.
The problems here go a bit beyond them being the steward of information or arbiter of right vs wrong. They'll deny you service for any or no reason, and leave no recourse when their algorithm malfunctions.
That said, they can ban distribution of misleading content. It's their right, and no one can dispute that. I'm not sure what people hope to accomplish by expressing outrage over this. We wouldn't want providers not to be able to decide what content to distribute.