Mantra of the gig economy: “Experiences driving with Uber may vary”

A radio ad from Uber for drivers ends with this disclaimer: “Experiences driving with Uber may vary.”

Is this here for legal purposes? To accurately describe the variability in the position?

Jobs like these are often billed as easy ways for someone to earn some extra money: the drivers gets to pick when they want to work, they get to use their own vehicle, and the position could appeal who those who like to drive and/or meet people. This reminds me of Dave Ramsay’s common advice that those with debt should pick up a second job delivering pizzas to help bring in extra money. The flip side is that they may not be able to make that much money. They might have some unruly customers. The job puts wear and tear on their vehicle. The position may not last for very long or someone could be an Uber driver for years. Can someone make a decent living driving for Uber? Or, do they also need to deliver some Amazon packages, do freelance writing or web editing, complete some TaskRabbit jobs, and be a cashier somewhere to make ends meet?

Overall, the disclaimer strikes me as a pretty succinct way to summarize what supposedly is the wave of the future: workers taking on a variety of jobs as they so choose. I would guess Uber is not trying to engage in such metacommentary yet it can be hard to pin down many corporations on exactly how they view their employees or contractors.