The feds seem satisfied to allow Uber to classify workers as contractors so far, and California doesn't, so yes, the rules do vary.
People who work for Uber as contractors can accept or decline rides, and only accept rides at a rate they want, so yes they are setting their rates. Just as a software contractor can accept or decline a job based on the rate offered. You're entitled to accept work at a rate you want, but you are not entitled to be guaranteed work at the rate you want.
People who work for Uber as contractors can accept or decline rides, and only accept rides at a rate they want, so yes they are setting their rates. Just as a software contractor can accept or decline a job based on the rate offered. You're entitled to accept work at a rate you want, but you are not entitled to be guaranteed work at the rate you want.