The article says EU banks can borrow at up to -1%. The article also says, "put that cash into the Federal Reserve’s reverse repo facility, which allows banks to park cash for a return of 0.05%." They get paid to borrow and then paid to deposit what they just borrowed. Anyone see a problem with this risk-free infinite money mechanism?
They are not getting paid, because those are nominal interest rates, not real interest rates.
They are getting paid for risk-free paper shuffling.