I will add that posts across the world were provided an exclusive privilege, a monopoly, to deliver letter mail. As letter mail continues to decline, that source of funding will be insufficient to maintain the universal service that exists today. As postal services transition from a message-based delivery system to one that's focused on goods, on logistics, on parcels, we need to ask ourselves as a government what universal service means today.
Many other countries are moving to things like alternate day delivery of letter mail, while others, as Lorenzo mentioned, have decided to subsidize their national post. Out of the roughly 192 member countries of the Universal Postal Union, which is the UN technical agency for the post, more than half today provide subsidies to their posts in one way or another to ensure that they can maintain universal service.