You can deliver pizza in a worn-out old car. 'Duper has standards for their vehicles.
The taxi company I drove for also lobbied to force 'duper's vehicles to be inspected by mechanics... Semi-annually, iirc.
Edit: the inspections were probably mandated every 3 months (quarterly); the taxi company inspected its version of ride-share vehicles bi-monthly (iirc), which just cost their drivers time (because the mechanics were already employed by the taxi company), whereas an inspection was another cost for 'duper drivers.
Plus, in 10 years we have robot cars and the economics totally shift.