They are driving for Uber because they can't find/get/keep such a job. Of course everyone driving for uber is doing so because it's the best thing they can find, they wouldn't prefer a job that pays them even less. But the people I know doing it don't love it or prefer it to a "normal" job, they just do it cause it's available and they need to pay the rent.
Additionally, there likely exists a framing bias along with a false dichotomy, if they were asked whether they’d rather Uber or take a “normal job”. There are of course plenty of alternatives that are not “normal jobs” (whatever that is exactly).
Anyways, anecdotally, I’ve had drivers who were not happy with Uber and continued only out of lack of current options or plain inertia.
https://en.m.wikipedia.org/wiki/Survivorship_bias
Now if I could somehow know whether I have any biases I should be aware of, I’d greatly appreciate that information, Steve.