Applied nonexpiring Uber credits before expiring Amex Platinum credits

In a benefit to American Express Platinum cardholders, Uber offered $15/month of credit. But Uber applied its own credits (nonexpiring credits for customer service problems, drivers taking long routes, and similar service shortfalls) before tapping the expiring Amex credits — to a customer’s detriment, because a customer would always prefer to use the expiring credit first.