No they don't. Provision of ppe, pay etc is entirely on the owner/board of your firm, not on the contractee unless specified in the contract itself. If you want ppe, bitch to your boss about it or buy your own.

You don't know what you are talking about. If a DSP is out of line or not following Amazon policies they are penalized by taking routes away or straight up cancelling the contract. These DSPs do not deliver for ANYONE else other than Amazon. This means Amazon has de facto control over policies, procedures, etc. Fuck, dude, Amazon made the goddamn app I use to do my job.

I'm done with you. Before that, I need you to do something for me. Go look into the mirror clean the shit stains off your lips before you slobber on another pair of big black boots.