In fact we actually hired people that hated the old/current Postmates model.
But basically, it's not an easy business model and it's not one that makes financial sense, no matter what the funding, city, tipping situation is.
Deliveries = Time Time = Money
If you want someone to have time to make deliveries, you have to pay them enough money to have that time. Until VERY EXPENSIVE robots and cars replace people, deliveries will always be expensive, and relatively dependent on the speed of traffic + production. And even once we have robots, we'll need to charge enough to cover the robots, the guy that repairs the robots and money to invest in the next robot. That probably will be more than an dollar... especially when you factor in energy for the robots.