Gonna go ahead and be an accountant about this: all those companies are following a strategy of selling at a loss to strangle competition. They're trying to become monopolies. They *are* building equity every year and will jack up prices once they have a monopoly. https://twitter.com/edburmila/status/1296880150664097792
Also, as should be said endlessly, USPS *is* profitable if they don't have to fully fund their pension for workers not yet born (a requirement imposed on them that is wholly unique *anywhere*) and they are still only a few billion short. Without it, they are wildly profitable.
But it's a public service and why do we expect it to make a profit anyway? I don't know! But I do think it's remarkable they did such an excellent job. They were a great, humane place to work that made the world more accessible, and they had to be sabotaged to fail. That matters.
It matters that the USPS did everything we are told makes something a failure under capitalism and it took the government imposing bizarre accounting practices and outright sabotaging their equipment to make them do their jobs badly.