The problem for restaurant-employed delivery staff is nearly the same as the customer-employed delivery staff mentioned above.
And yet somehow we had restaurant delivery for 50 years before the invention of the cell phone. And grocery delivery for a hundred years before that.
Both pizza joints, and the Chinese place I order from employ their own people.
The only thing that's changed is that a certain cohort of people are terrified to pick up a phone and speak to another human being, and so delegate that most basic of human functions to a computer program.
The only actual utility of these apps is the ability to track and obsess over the precise location of my food, as if I'm going to die of starvation if I don't know exactly where it is.
And for that I am happy with simple web site. List of options I can have, basic modifications like remove or add. Some extras, and option to pay there and then.
It is sadly too small market nowadays...
Not only do a few of my local restaurants employ their own drivers, but they also use websites to allow for online ordering so I do not have to pick up the phone anyway.
Both pizza joints, and the Chinese place I order from employ their own people.
This is the crux of the matter. We're not living in the "2 pizza joints and a Chinese place" world anymore. In my city there are hundreds of restaurants serving cuisines from half the countries on the planet. Portuguese, Spanish, Italian, French, British, Nigerian, Ethiopian, Eritrean, Mexican, Salvadoran, Peruvian, Brazilian, Korean, Japanese, Chinese (including Cantonese, Sichuanese, Shanghainese, Taiwanese, and Hakka), Indian (too many to count, likely from every province in the country), Pakistani, Bangladeshi, Sri Lankan, Thai, Vietnamese, ...
We also have movie theatres selling popcorn, Dairy Queen selling Blizzards, StarBucks selling frappuccinos, and McDonald's selling McFlurries, doughnut shops selling Boston creams, dessert shops selling matcha roll cakes, ... I didn't even mention pizza joints!
In other words, the delivery apps bring customers an explosion of options they never had before. That is their highest utility for customers (while offering the risk pool solution to restaurants).