People who are considerate, pay attention to instructions, care about your food, etc, can't afford to continue working, because they don't deliver often enough to afford rent.

The point of an auction model like these apps use is to drive down labor prices to the lowest bidder. There's no force pushing quality up, because people cannot ban certain "known bad" drivers and the rating system is non-functional. You will only ever get laborers who don't have better choices to sell their labor to. Specifically, the apps don't care about bad service, because it empirically has not stopped people from ordering. People will literally have a delivery driver eat the meal they paid 2X for and still order again from that service, because the entire system provides plausible deniability that "surely that was a fluke and this time I will have a different, better driver, right?"

American consumers are insanely un-discerning. They are willing to pay huge markups and get radically bad service on a burger and fries for whatever reason.

Also consider how many of the people working this "job" literally cannot read english.