Moreover, the parent misses the forest for the trees: yeah, the congestion fee is lower than the fare, but the fare is vastly more expensive than driving a car.
The current pricing model encourages resource sharing (this was true before congestion pricing as well), and the choice of whether or not you take a car or a cab is a function of the amortized cost of use per unit time. So yeah, just in terms of congestion fee it's a little bit cheaper to take an Uber for a single trip, but if you ride around in an Uber all day long, it's way, way less cost efficient than driving your own car.
The current pricing model encourages resource sharing (this was true before congestion pricing as well), and the choice of whether or not you take a car or a cab is a function of the amortized cost of use per unit time. So yeah, just in terms of congestion fee it's a little bit cheaper to take an Uber for a single trip, but if you ride around in an Uber all day long, it's way, way less cost efficient than driving your own car.