TIL: USPS makes money with its own budget while USPS get some funding for government programs like rebates.

So yeah, they can sell that data legally.

https://about.usps.com/who/profile/

> he Postal Service generally receives no tax dollars for operating expenses and relies on the sale of postage, products and services to fund its operations

Apparently it is because the USPS has a special carve out from congress exempting it from disclosure of "information of a commercial nature", subsection (c) here: https://www.law.cornell.edu/uscode/text/39/410

Probably because of the silly idea of quasi-privatization,

> But, beginning in the 1970s, the Postal Service largely stopped receiving any taxpayer money for ongoing operations. Postal operations are instead funded by sales to you, the postal customer. Now it depends almost entirely on sales to keep the lights on.

https://www.uspsoig.gov/focus-areas/did-you-know/postal-serv...