> If Uber has let so many drivers on the app such that they cannot earn a minimum wage, they should stop aggressively enrolling new drivers.

Why? All Uber cares about are the fees it collects, which are dependent on the total number of miles and total number of rides. It has no reason to care if its drivers make minimum wage or not, unless it can be shown that if they cannot, Uber will not have enough drivers. Fortunately for Uber, there is no evidence that this is the case.