I agree with you but I wonder if a court might say it's more like hiring a gardener to water your flowers and then when he doesn't want to change your flat tyre you cancel the contract. At the end of the day though short term/casual contracts are cancellable. I don't think anyone wants a world where you can't get rid of contractors when you want or need to.

In that specific case he might still be ruled a contractor, sure.

But if you expanded the list of duties to be sufficiently large and indefinite ("gardening and whatever else I need"), then a court might rule that you have created an employment relationship and are responsible for providing various other benefits.

So it would seem to favor the "employee" classification if Uber had a long history of "oh, and you also need to take these other requests ... oh, and support spotify integration now ... oh and you have to auto-accept requests before you're done with the current."