I'm a little concerned that over time, it is going to become more difficult and less private to move money out of Coinbase. Even now they ask you "where do you send your money? is it another website?" when you try to withdraw. This is unacceptable.
I'm talking about a whole community, not individuals. If some individuals are burned using centralized service, all others can learn from it and move elsewhere or choose more wisely. Not so with banking system which burns everyone and no one can opt out or compete with it.
