Banks are scared of digital currencies technologies such Steem, because these are disruptive technologies to the banking/money industry as well as managing money.
Just like the E-mail disrupted the Post Office business. The fact is virtual currencies are also taking away the business from the banks to the people.
People are going to be their own banks in future. You will be able to move with your money in your digital wallets such as Xapo.
Secondly, they are proving to be a better place of investment and saving. For example, it may not make sense as of now to save money in your bank. Yes, the bank may give you Interest on your savings but they may not match up with what you would earn, if say, you right now invest in digital currencies. Virtual currencies have proved to be the Future form of money and their acceptance levels are growing.
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