It's not really 'random people'. ^^
It's self-employed registered, licenced taxi drivers, working under Uber.
You can rate your Uber taxi driver and easily complain at their website.
OT: Yes, but I've never paid, usually with my sisters who do

I've used it around 4 times.
Off topic but I heard a story about two passengers in an Uber and kindly asked their Uber Driver to go to a McDonald's Drive Thru and politely asked the driver if he wanted anything, driver ordered large fries and a milkshake
