The problem that I have yet to see DoorDash et. al. solve is that they're injecting a middle-man where one doesn't need to exist. The typical delivery model of a local restaurant worked just fine without them, but with a third entity holding their hand out for money in that system it becomes net negative for pretty much everyone involved.
> they're injecting a middle-man where one doesn't need to exist
a food logistics service should exist, as (if done well) it should scale better than local restaurants doing their own delivery.
and every new hire got taken to the whiteboard to learn about sort algorithm performance: bubblesort is O(n) in the best case.
and in our codebase, the data being sorted fit that best case (the data was already sorted or almost sorted).