Jamie Dimon is on a mission to destroy bitcoin. After labeling it as fraud and bubble, he is now saying it is worth nothing and installing fear to the market by stating that governments will imprison people who use it. See https://www.cnbc.com/2017/09/22/bitcoin-jpmorgans-jamie-dimon-lays-into-bitcoin-again.html.
Such statement not only shows lack of respect for blockchain technology, which provided many benefits that come with adoption of bitcoins including faster transaction, lower fees (no need to pay bank or exchange transaction fees for converting different fiat currencies), and decentralization, but also indicates banks' fear of massive adoption of bitcoins.
It is unfortunate that people in the rank and position of Jamie Dimon makes such statements to cause market confusion and fear through harsh words. His act is irresponsible, oppressive, and an antithesis to the foundational value of democracy.
Jamie, we live in a world where freedom is highly valued, people using a new and superior means of transaction (digital currency) that is superior than current one (fiat currency) should not be imprisoned.
Bitcoin fans will prevail despite current headwind!!!