I'm not sure I've seen a formal definition of wage theft. Certainly I can start a poorly performing business in Seattle and lose money or could make less than minimum wage. It doesn't feel like anyone is stealing money from me there.

Some work produces less than minimum wage value. Minimum wage was initially created to price minorities out of the market. Cutting off earning opportunities that people would do (and they're currently doing it) but that fall below that arbitrary earning floor only restricts total earning opportunities. That so many people seem to be willing to drive for ride share companies tells us it's currently better than any other alternatives and that they're willing to accept their current payments.

Doesn't matter what minimum wage was used for if we agree that it works for us today.