As DoorDash likes to remind people over and over again, "Dashers" are not employees. The person you are delivering to is not your customer—it's DoorDash's customer. As a Dasher you do not have the ability to negotiate price, or terms, or anything really. All you can do is play the game.

Both the person delivering and DoorDash's customer see each other as abstractions. The person who ordered wants a service, but isn't willing to pay what that service costs. DoorDash's business is not viable if they had to hire employees. Instead they create a game that you can play where you get rewarded for doing what is, effectively, fetch quests. The people you are delivering too might as well be NPCs. You get seemingly random amounts of money for completing each task.

In order to win everyone comes up with their own strategies that evolve over time. Each change in tThis is what causes all of the anomalies that people see and complain about it. The "customer" incorrectly thinks that the person delivering is an employee doing a job. The person delivering sometimes thinks of the person they are delivering to as their customer. Neither are true. The person delivering is playing a game where they are trying to find a strategy that makes the most amount of money in the least amount of time. The best Dasher is trying to find either their own unique strategy, or carefully walk the line between maximizing their returns and getting banned. They have no incentive to provide "good customer service" as you'd normally think about it, because the person they are delivering to is not their customer.