Many rich people wouldn't suffer if Uber could just forcefully employ people at will, keeping them hostage, if Uber could arrange something like that. But that hurts the people who are being kept hostage. When we create/remove/modify regulations, both sides of the coin needs to be considered.
In this case, it's less about how good/bad Uber is for passengers and more about how Uber is exploiting their employees. Even if everyone loved Uber as a passenger, we can't allow them to exploit other human beings.