The internet is increasingly becoming an institutional web, with coordinated auth across systems ... but no answer to the Q:
By what authority does this action occur?
Identity systems solved authentication.
They rarely solved legitimacy.
New essay: 

Gareth Farry — Law, Culture & Technology
The Institutional Web – Coordination, legitimacy, and the next layer of the internet
For most of its existence, the internet has been understood primarily as an information network. Websites published information, just as platforms ...