A minimum wage of $7/hr in the Bay Area or NYC is useless. That won't cover transportation. $14/hr is still, basically, the same amount of more or less useless.

In, to quote Ken White, "pluck-my-banjo" Texas, that's a perfectly fine and livable sum. A dollar or two raise and you can probably start saving up for a house realistically. $14/hr is kingly.

Amazon warehouses are usually not in banjo-playing rural areas, but rather as close to major towns as is economically feasible for Amazon's rent bill.

This is neither a basic income nor a federal minimum wage problem. This is a lack of competing opportunities for minimally skilled workers problem. If these same workers had realistic job opportunities that paid well, then Amazon would have to raise wages (and pass some of that onto the consumers, but, that's relatively nothing).