What's your source? I searched for "google duplex fraud" and found a few results indicating that maybe the "businesses" called during the demo weren't real? I can't find anything that proves this assertion, but even if I could I'm not sure I'd label the whole demo fraudulent in terms of displaying the state of the technology. For a fraudulent demo I'd expect to see evidence that the system's responses were actually generated in real-time by a human controller, but I haven't found anything online that makes this claim.
