Ancedotally (I don't have a ton of concrete details here):

1. From what I understand restaurants doing delivery largely were breaking even on it considering the costs - there was no third party looking to take 20-30% of the gross.

2. Again anecdotally, I suspect the old school pizza/chinese delivery places are more efficient in terms of deliveries per driver per hour. What I see with a lot of UberEats/Grubhub etc is drivers waiting a lot at restaurants, bouncing around a bunch to pick up one or 2 orders each. Vs the old-school pizza model of a driver being able to pick up a bunch of orders at once.