Each city is pretty independent so there's not much incumbent advantage.
Seems like a reasonable discount would get someone to try a new app.
Drivers aren't loyal. If a restaurant uses any app they probably don't care where the order comes from.
Taco bell and other chains might be hard to get but is the market for taco bell or mcdonalds that big for delivery? and seems like it clutters the app anyway.
DashPass what does it get you? lower fees they should be charging anyway?
Am I missing something?