My guess is that Uber subtracts it from the amount that Uber would pay the drivers for the credit card transactions. They still support and encourage use of cre

My guess is that Uber subtracts it from the amount that Uber would pay the drivers for the credit card transactions. They still support and encourage use of credit cards. If a driver didn't deliver cash to Uber they would probably be deactivated. If they had an excuse for it they could try customer service.