It is quite clear the trick Jamie Dimon use to do, shouting "Bitcoin Fraud", create fear among some investors and resulting in a drop of a price.
Many recent resources claim that it was done for purchasing Bitcoins. More than that, all JP Morgan's employees couldn't buy Bitcoins for themselves as the company made it forbidden for them.

And now? They are launching a cryptocurrency.

In my opinion, the sixth largest bank in the world, that value by more than 2.5 trillion dollars cannot act like this, as it is truly unethical.
Now don't get me wrong, there is NOTHING illegal in their actions, but isn't it a hole in the current regulatory system?