Actually it may well be the other way around: the banks may be the ones refusing to pay what Apple asks for and meet Apple’s other demands. Apple can be very demanding. That makes it harder to find partners, and for Apple Card and Apple Cash Apple needs a partner bank in each country where they want to roll out those services.
On Tim Cook, as long as he’s a good money man they’ll keep him in his place. Remember they are americans after all, and for americans money is the top priority, even above their own life.