re: Why is the USPS allowed to continue to operate at a loss each and every year?

WTF? I haven't not pre-printed a USPS label in 15 years, the same as I haven't not pre printed a Fedex/UPS label in the same amount of time.

You are incorrect, you can live in BFE, and Amazon, UPS, and Fedex will give you a delivery expectation and likely hit it. Meanwhile, USPS will take 3 weeks to forward mail from one zipcode over.

There are plenty of POs that have a steady flow of old farkers and foreigners paying whatever they're told at the counter. Ask yourself, why wasn't USPS competitive in bidding on being the intermediary for Amazon/Fedex/UPS as opposed to USPS? Why couldn't USPS have built a fleet of older planes that nobody wanted and made their own network?

Let me guess, not enough money from FedGov.

Because they operate like a government agency.