Ah yes, the calling card of people that think systematic exploitation of workers in a global economy where only the top few are gaining wealth is fine because "free market rules" matter in a world full of regulatory capture and industries with too high of a barrier to entry to foster true competition.
The article is literally about true competition being attempted in a high-moat business.
Amazon isn't offering to deliver Walmart packages for a price.
"...the new service will entail the online retail giant picking up packages from businesses and shipping them to consumers."""
Of course what Amazon will pay their delivery personnel will match the quality of Amazon service, such as it is, anyway.