I didn't read it as "Amazon is ripping off the USPS" but rather "Amazon is benefiting from the USPS needing to deliver everywhere in the US, even places where UPS wouldn't deliver".
I live three blocks from the post office, my grandma lives 25 miles and down a dirt road from her nearest post office. It's hard to argue that my deliveries cost the same as hers, yet we pay the same price for postage.
--edit: I hold no opinion either way on the subject, just clarifying based on what I understood from reading it.
"Amazon is benefiting from the postal service's reliable, universal delivery" seems like one of those stock phrases we tout out as to why investing in infrastructure is a good idea.
I live three blocks from the post office, my grandma lives 25 miles and down a dirt road from her nearest post office. It's hard to argue that my deliveries cost the same as hers, yet we pay the same price for postage.
--edit: I hold no opinion either way on the subject, just clarifying based on what I understood from reading it.