I agree that these practices are worker hostile and inexcusable bullshit. But I don't think your understanding of their policy is correct. My understanding is

I agree that these practices are worker hostile and inexcusable bullshit. But I don't think your understanding of their policy is correct. My understanding is that they have some guaranteed amount that the driver will get, and DoorDash/Amazon will then pay the difference of the guaranteed amount and the tip. There is no ceiling - the driver always keeps all of the tip, but the delivery fee will modulate down to some minimum.