Facebook’s Calibra is a secret weapon for monetizing its new cryptocurrency

Facebook's PR acts like people who didn't have money available will now suddenly have it on their phones, but the Libra technical docs say one can only obtain Libra by buying it with fiat (or by buying their separate investment tokens.)

Since the unbanked aren't qualified investors for the token, that means every Libra they get will have to come from someone's other credit card, PayPal, or bank account.