... services followed a similar route. Courier services were a private offering until an upstart maverick came up with the insane notion of a *government run* messaging service. Must've been some a-rab: bin Yamin something or other. (https://www.history.com/this-day-in-history/u-s-postal-system-established)
And of course, high-value carve outs for overnight messaging became A Thing as jet air transport took off in the 1960s (after the USPS helped subsidise both rail and air transport in the 19th and 20th centuries): DHL, FedEx, UPS.
Generalistic and moderated instance.