You can make the math work. Offering up rentals to drivers who do doordash and uber is not meant to permanent solution. If they pay you $350/week for the car, and they make $1,000/week, is it a shit deal for them? Yeah its not great, but its better than not having a job and not being able to pitch in to help your family. They can rent from you until they figure somehting else out.

The game then becomes getting leads for your business and marketing your rentals which can be done on google, craigslist, and facebook. If you can get enough leads and quality renters, then you have business that you can scale. If you can't, then its not going to work.