If they pack the alcohol up in a crate, and then ship it to the person after they make the order in person? Less clear yes?

If the consumer goes to a place it is legal, and consumes it there without bringing any back, most people would say ‘meh’. Depending on the product. Hard drugs and sex work, being two common exceptions that some countries get more worked up about even traveling to ‘enjoy’ it.

But ship it back (especially hard drugs or sex workers!), and almost all people get more concerned.

The issue here is exactly why customs typically is a mandatory ‘gate’ for packages AND passengers entering a country.

Similar, one could say, to a giant country level firewall?

And why it is so lucrative for smugglers, which are defacto performing a type of arbitrage eh?