> The USPS, for example, is a service. It's not really a business, it doesn't have to be profitable it ideally has to be sustainable but I wouldn't say it's a necessity. Not only that, it subsidised private businesses like Amazon.

USPS is profitable, though. (even if Congress messes with their retirement accounting to make it look worse)

If they subsidize anyone it's China, because we forced them to do that by signing the UPU treaty. After that it's people who buy forever stamps.