All of this hypothetical except for the fact that Wal-Mart is known for a) ruthless schedule management like keeping workers locked in warehouses b) a known price-cutter both on vendors and employees to the point their employees often qualify for state aid for under-employed / under-paid (i.e., welfare benefits).

Given that, it'd be surprising if an non-exploitative option will be available for the workers who will be doing these deliveries.

But of course, we'll see.