Not only Brussels causes people to scratch their heads, the European Central Bank with it's quantitative easing with low and even negative interest base rates brought many banks to the brink of collapse. After a recent series of rate rises the banks can breath easier and are finally making a few bob with their natural reticence in passing the rate rises on to savings accounts.
In their latest meeting the ECB found they had no need to adjust the interest rates just now so they decided to twiddle with something else. All European Banks have a minimum reserve, security funds deposited with the ECB which attract no interest. Currently this is set at 1% of the Bank's trading value and has been for years. They have decided that 10% is a much nicer sum to demand from banks already on the ropes.
With many firms suffering cash flow collapse, in the current climate these additional costs to the banks could cause a shortage of available credit and those costs will inevitably end up with the customer.