Kazi drives a Toyota Prius for Uber in Los Angeles. He hates it. He barely makes minimum wage, and his back hurts after long shifts. But every time a passenger asks what it’s like working for Uber, he lies: “It’s like owning my own business; I love it.”

Kazi lies because his job depends on it. After passengers finish a ride, Uber asks them to rate their driver on a scale from one to five stars. Drivers with an average below 4.7 can be deactivated — tech-speak for fired.

Gabriele Lopez, an LA Uber driver, also lies. “We just sit there and smile, and tell everyone that the job’s awesome, because that’s what they want to hear,” said Lopez, who’s been driving for UberX, the company’s low-end car service, since it launched last summer.