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According to the best estimate available (which isn't very good, but Bitcoin is hard to measure), 50% of all Bitcoins in existence are owned by 0.1% of users. There are only a few thousand Bitcoin owners in total out of the 6 billion people in the world. What's more, Bitcoin's designed so that the amount of control over transaction processing you have depends on how much you can afford to spend on hashing hardware - if a bank wanted to, they could spend about a million dollars and make sure that no Bitcoin transaction could be completed unless it gave them a cut.