I’m sure it works fine most of the time but I’ve never been a patient/people person who feels it’s worth my trouble to save a few dollars.
My father had a stint driving cars and he was appalled by the story since it was common to a) treat customers with respect (including their time) and b) expertly know how to navigate around a city.
If we’re lowering the denominator of quality of service with casual drivers then I’d rather offset that risk by reducing such responsibilities and variables on the drivers.
Are you talking about more people than seatbelts? Or just having three people across the back seat?
If you choose pooled options ride-sharing companies go by the nominal capacity of the car, so four passengers plus the driver in a standard five-seater car.
If the street is busy it can be hard as a pedestrian to safely get to the other side of the street. I've also had drivers just go the wrong way like I was standing between Gough and and Octavia on Market maybe 10-15meters from Gough. The driver came down Gough and turned left on Market at which point I knew it would be > 10 minutes before they could make all the correct turns to get back to pick me up. I cancel the ride and was surprised the system didn't direct them better.