The question to ask is, if Uber disappeared off the face of the earth one day, would these drivers be better off, or worse off? I claim they'd be worse off -- if there was a better job available, they'd already be doing that instead of driving for Uber.
In other words, Uber is a positive force in their lives, an employer who made them a better offer than any other, and they've getting shit for not making the drivers an even better offer?