This is very interesting. They've tried to do a rental car version of airbnb and just like NY state tried to crack down on it, rental car companies and SFO airport are trying to get them shut down. Why? Because they don't pay the $10 or so that rental car companies pay the airport per transcation.
Would jalops like to let others drive their vehicles? I wouldn't. Its too personalised to let some random stranger use it. But for a lot of people, their cars aren't that important and might just be a nice way of some cash when its not being used.