This principle only makes sense if the contributions are funding a common service with a fixed cost. If there is no upper bound on the maximum cost, as is true of corporate profiteering, it is merely extraction with none of the progressive overtones as there is no longer a relationship between what you pay and the common good.

This ignores that ubers and lyfts are a bandaid on our abysmal public transit and are a play by the wealthy to corner the transportation market until they can jack up the price for their own benefit.