You can ask Visa, Mastercard, Stripe, Spotify, Paypal, Uber, or any of the other founding members if they feel like their lawyers seem convinced they each have a legal vote equal to Facebook's.

Do you really believe that each of these orgs, many traditional with whole legal departments, would sign on to a public association with this potential without crossing their i's and dotting their t's?

Don't trust Facebook, trust that the 27 other companies (and their lawyers) don't trust Facebook.