[Someone]

Either Uber runs a legal business, in which case I would expect others can start similar businesses, or they don’t, in which case this is like complaining that you can’t start a local mob legally after the one you worked for kicked you out.

Yes, that may be difficult, but Uber has shown it to be possible; ‘just’ find some investor with a few billion to spare, and you can do it, too.

Returning to the original argument: even if Uber drivers were employees, the argument “Uber can’t kick me out because I can’t get a job as an Uber driver elsewhere” doesn’t hold water, and replacing “Uber driver” by “driver” doesn’t change that.