I can't be banned by my power company or my water company. Perhaps if Facebook wants their login to be treated as an essential service for multiple products, they should be regulated like a utility...
I expect that's what they want. Oauth logins could be regulated by government in a similar fashion to mobile spectrums and it won't be easy for competitors to pop up.
Well, we already have Google fiber and Google phone service. So there are some utilities you can get banned from because of happy birthday playing in the background of a YouTube video or something...
Or you know stop doing that.