I think that when a sales trader in investment bank front runs his clients orders, or sells junk bonds with lucrative yields, that is a fraud...
True but the problem is that kind of fraud is allowed and people no longer even see it as fraud, just look at the interest rates, people think of high interest rates as usury, but in the past any interest rates you were asked to pay was usury and it was illegal but now people are so used to being robbed that way they no longer see that as a crime.
Everybody has his own point of view. If bitcoin is a fraud then all the other digital currencies would also be fraud including ripple which is widely being used by banks. He is a banker and his fear is being reflected in his statement.
There are rumors about JP Morgan holding on some bitcoins also. If China has failed to destroy bitcoins, then Jamie is actually negligible.