That's about a 2% fee which doesn't seem out of line with other transaction processing fees that are out there. That fee probably has built in insurance for fraud and other failures. And also the cost of the transaction. I bet that fee is the same fee as a year ago?
This is the wrong way to think about it. Rates are nearly negative, so 2% is practically 10, 100X the rates banks can earn otherwise. It's basically free money shoveled into banks, a massive boon.
An uncharitable reading might assume a spurious correlation.