A real union is more than just a collection of people getting 'organized'. A real union possesses legal rights to have the government, in effect, control labor rates for a class of services in a certain area. It's a good deal for union members.

OTOH, for consumers seeking less expensive rides, it makes the services more expensive. It also means that workers who are satisfied with offering their services at a lower wage (because it means they have a higher chance of actually finding work) are not allowed to offer their services at that lower wage.