Delivery driving apps take advantage of people who do not understand the math behind the job. It takes a vehicle, gas, insurance, time and risk to do deliveries and one accident or repair can take them off the road for good. I worked as a delivery driver for a while, using my own car, and I would NEVER recommend this type of work for someone who wants to get ahead and actually earn a living wage. It's a hard way to make an easy living.
I don't know anyone who can earn a proper living wage on it. The people doing it seem to live, but their quality of life and living conditions don't seem to be anywhere near the local average.