Correct me if I’m wrong but the job is basically:
You're wrong, but it's understandable. The key point you're getting wrong is: You make money from a job.
The pay for most of the assignments you get from DD or UE is usually not enough to cover fuel, let alone maintenance on your vehicle. Certainly less than minimum wage for your time. Which is legal for them to do, because you are a contractor, paid per job and not per hour. If the customer doesn't tip, you are earning less than minimum wage at best. In many cases, you're actually paying to work, but you're forced to take these unprofitable orders just to maintain your rating and keep getting assignments. (In my area, drivers call this "eating shit")
At best, you can take about 6 assignments an hour. To net minimum wage, you need at least three of them to tip well. When a restaurant doesn't bother to start preparing the order until you arrive, the time you waste waiting is 2-3 orders. If any of the remaining orders that hour don't tip, you're below minimum wage.
It is a shitty, exploitative service that nobody should be using. If you are going to use it, be aware that the service is taking everything you're paying, and completely shafting your driver.