JP Morgan tries to brand their "JPM Coin" as a cryptocurrency, but in reality is far from it. One of the most prominent and IMPORTANT features of a blockchain-based currency is that consensus is maintained publicly through a democratic manner. This is known as decentralization- where there is no central entity running the system.
JPM Coin fails in every aspect because consensus is maintained PRIVATELY. They own all the means of block propagation (fully centralized), so therefore they have the ability to rewrite, delete, or modify data on their "blockchain" at their leisure. All in all, JPM Coin is no different than the digital fiat money banks lend out.