Think about how impossible it is for banks to do with cryptocurrencies what they do with fiat dollars. If you go to borrow money, the bank takes your IOU, and logs that on its balance sheet as an asset. To "balance" that asset, it logs into your account an equal number of digital dollars. These are not dollars that come from anywhere. They are not the dollars of other depositors. They are manufactured out of thin air to "balance" against your IOU. But if you went to borrow a cryptocurrency, the bank could not loan you any, UNLESS it actually had them, and transferred them to you. No money creation would occur. And without money creation, the banks would have to earn massive interest on true-transfer loans. That's why they're scared!