At least in my country, there has been serious laws protecting the users from police opening letters (1962:700; Postlagens tystnadsplikt). This was changed in January 2023 because people exploited it to send drugs thru post office [1].
Of course without any protests in Sweden because again people don't realize their rights to privacy are taken away from them.
1: https://www.svenskhandel.se/nyheter/nyhet/lagandring-ger-moj...
1: https://commons.m.wikimedia.org/wiki/File:Rational_harm_asse...
Yet I can go to certain neighborhoods in Stockholm and get pretty much every thing under the sun and that's open 24/7.