Delivery workers should fuck up their backs because otherwise (1) customers would get their shitty fast food and soggy fries 15s or 20s later, and (2) boxes would eat into the profit of the shareholders.
Reminds me of seeing amazon workers struggle to drag those plastic boxes full of deliveries around the sidewalks of the neighborhood while UPS provides a hand truck. I get it, a hand truck cost more than that 10 cent box they abandon all over town.