AFAIK, no one has been able to prove anyone has paid a membership fee...the foundation doesn't publish a privacy violating list of payers / identities & addresses...duh. The expectation that large membership fees would be paid in a single tx is a bit misguided, imho.
Well, I had understood that they promised to accept donations only through a specific address, precisely so that everybody could check their accounting.
But that is indeed an interesting philosophical question: how can we get to trust a Foundation devoted to the cause of a trustless anonymous payment system.
