This sounds like fine model to me, pay more, get faster service. The key should be transparency and a minimum service level, ie. they should lay enough by default that every order will get picked up.
In general, higher pay for better quality goods and services is part of a negotiated sticker price. Tipping is the anamoly here. In the DoorDash context, if the user were given the option to tip after delivery, they’d most likely just forget about the app once they got their food and never tip. So there’d be little incentive for the drivers to work hard for a good tip.
Anyways, aside from this point, whatever these startups are doing, are real shady. Them carefully choosing their words in the binding documents makes it even worse since they know the potential repercussions of these actions.
On the other hand, what does the driver do if they go above and beyond to give you great service, but then you don’t tip?
I care that I want hot food, delivered in a reasonable time, and that I can pay a tip AFTER service is rendered (based upon the actual service I get).