If the car breaks down you will have to pay out of pocket or with your own insurance. And the car likely will break down as these are just normal citizens renting out their cars. Most of them don't know much about car upkeep.
I spent hours on home with Turo road side assistance and never even had a human take the call. The host did return my call eventually and said he couldn't help. He called Turo and the person we spoke to said roadside assistance usually takes many hours to even answer their phone, and then a few more hours to dispatch someone.
Don't do it, it's not worth it. Use a reputable car company. You've been warned.