He been realize that what he was saying a months ago was incorrect [I would want to say it "incorrect" other than "wrong" as i believe that dimon is a true and professional businessman ] In my opinion he under estimate the capability of bitcoin or what he was say a months ago is just a strategy, he make him self a a bate to lower the price of bitcoin and then dive in after it dump out. Now he see the potential of crypto and bitcoin for him to get safe in the financial eco-system he provably need to shut his mouth up. But dont forget what his capable of. Still he is one of the big name in wall street.