Antitrust laws are intended to prevent anti-competitive practices. And if anything qualifies as an anti-competitive practice, fining and jailing people for competing with you certainly would. Which brings us to this little tidbit from the Code of Federal Regulations:
It is generally unlawful under the Private Express Statutes for any person other than the Postal Service in any manner to send or carry a letter on a post route or in any manner to cause or assist such activity. Violation may result in injunction, fine or imprisonment or both and payment of postage lost as a result of the illegal activity.
I expect the Department of Justice to launch an investigation post-haste.