This could serve as a cautionary tale. A good reason to diversify holdings between banks and other stores of value like bitcoin.  

Banks have pulled stunts like this for years. They appear to be growing bolder and more blatant with exploitive and predatory practices. Deficit, debt and economic slow down could represent levers which increase these tendencies. As floundering economies can have a tendency to influence leveraged assets held by banks into forming massive credit bubbles, which were unromantically bailed out in 2008. Those negative circumstances coupled with banks already over extending balance sheets could result in many banks inventing ways to make up the difference to maintain their bottom line.

There's a fine line where deregulated currencies and trustless financial systems carry a potential to outperform traditional financial institutions which are regulated and insured. It goes against the grain in terms of conventional wisdom. Yet perhaps we will soon see it as a harsh reality which could be a scary scenario to contemplate.