It was ambitious, yes. It was also blatantly obvious at the point of inception of the idea itself that government would become a problem. They exist for the exact purpose (among other purposes) to prevent this exact idea from working (at least unregulated and without a proper banking license). All of the recent history and the laws made this obvious. It is truly astonishing that Facebook haven't thought about this before, or were naive enough to think that they could just do this because they were so big.