The problem is people will prefer Uber Eats over competitors because they are able to deliver food for such a low price. The employees of Uber Eats are the ones paying for this not Uber.
He lays out two ways people can work in delivery. One pays significantly less for starting out, but doesn't require you to work specific shifts. The other lets you work whenever you want, but you are very much subject to what demand comes in. You have a lot more consistency when you don't have control over your schedule.