Sure, all that is possible, but you'd still be deprived of your vehicle when it showed up all funkified, while you then had to scramble to hail another vehicle

Sure, all that is possible, but you'd still be deprived of your vehicle when it showed up all funkified, while you then had to scramble to hail another vehicle - potentially making you late to your next destination. If it's your personal car, then you're stuff using such ride services until you get your car back. With no guarantee that a similar thing will happen to you when one of them picks you up.