The network effects are somewhat irrelevant and GP's comment is correct. If you do not use a retailer or service provider's business in a manner that they like, they are normally free to discontinue your service and ask you to leave. The same principle should apply to Facebook as they are a service provider like any other which has not (to my knowledge) explicitly been designated as having special status in legislation.

You can't decide Facebook is subject to a different set of laws or has fewer rights simply because people have arbitrarily decided to communicate on its platform more than another platform. Every private entity should be afforded the same rights to regulate their private property or services unless there is legislation specifically saying otherwise.

If you or any other person do not like the way Facebook is regulating usage of their platform, you are free to go start up your own social media platform with a different ToS (and many people do).