Unless you can provide actual legal documents as opposed to whitepapers, your argument is unconvincing. Nobody trusts anything Facebook says, which given their past actions is completely reasonable.
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.
Unless all the contracts are public you have no idea what kind of backroom deals they have with different organizations.
It may sound paranoid but that’s the level of trust many people feel Facebook deserves at this point in time.