

There would be no reason for them to keep a free service like that when they could charge the consumer for it instead.
No company in position to purchase the USPS would have any conviction to show goodwill towards their users. Only quarterly profits matter.
Because their current competition, the USPS does so as a service that’s paid for by your tax dollars.
Once that goes away, or is sold off, none of them have the incentive to continue to do so.
And in the end they will all eventually collude on raising the process for all of their services, just like every other ‘not a monopoly’ corporate collective.