Delivery drivers on some apps are told the expected pay for a trip. If you don't tip, they might decline the job because it costs them more to deliver then they

Delivery drivers on some apps are told the expected pay for a trip. If you don't tip, they might decline the job because it costs them more to deliver then they make. This makes your order sit longer until someone decides to do it, perhaps because there's a penalty from the company for declining jobs, and the driver is willing to lose money to remain in good standing