Jamie Dimon is no idiot. He spread Bitcoin FUD for his company to be able to buy bitcoins at lower prices. That's a smart move. Fraud would be a far more accurate adjective.
In business there ethical rules. It can be achieved by any legal means result. Before to accuse him of fraud need to be able to distinguish truth from nonsense. Besides, no one knows they're buying bitcoin or not. Maybe he really thinks so. What these idiots a little?