Minimum wage is a lower class of violation than most worker exploitations.
Uber drivers are over the minimum wage a lot of the time, especially the federal one. Nowhere near this $1 hypothetical.
A big one is that the actual wage you get is complicated. You get paid okay for the actual trips, as far as I'm aware. But how to handle the idle time is harder. There are valid reasons to say you should get paid for that time, and valid reasons to say you shouldn't get paid for that time.