They are massively overpriced and antiquated in structure. Their failures are why Amazon exploded and collapsed brick and mortar retail. A lot of small businesses are not viable because of them.
They reported a loss of 9 billion last year and 9.5 billion in ‘24. The agreement with Amazon is deteriorating. They are expected to deliver mail 6 days a week on time with no money now.

It’s a public service, it’s not supposed to be motivated by profit.

By “reported a loss” I think you mean, “the public service cost”

The “lost” revenue is because they are forced to pay for future employees who wont be born in the next 30 years.