Wow. I wrote about this at length in my book on logistics, I never thought any politician would do anything about it. For decades companies of every kind have used subcontracting to dodge responsibility for their workers.
If it looks like an Amazon delivery and drives like an Amazon delivery, then it's an Amazon delivery, right? Not according to Amazon. Big companies like Amazon have built a vast network of subcontractors who deliver their packages while shielding them from accountability.