Lots of people and articles out there now calling Bitcoin a scam/joke. Most of these people work in financial industry which is in direct competition with these Cryptos and ICOs.
I think the financial industry is worried about being destroyed by Bitcoin and other Cryptos so much that they need big shots like Jamie Dimon to scare potential stock and bond holds from selling their financial assets and investing in Cryptos or they are trying to slam the price down so the banking club can buy it up cheap.
You don't see them bashing Ripple or other financial companies spending millions on blockchain technology now do you?
RE: Is bitcoin a currency and is Jamie Dimon correct that it is a fraud - 'no' to both. Not throwing rocks but showing a few...