> This includes rules that govern what can and can’t be sold in a business transaction. This is a principle as old as government itself.
If we're talking about a "business transaction" as in an exchange of physical goods across the border, then I agree. I said that it was unjust, not that it was without precedent. You seem to be under the mistaken impression that I believe in the concept of government itself. The core of what government is, and does, is unjust. Arguing that governments have always done things this way carries zero weight with me.
Applying these rules (or any rules) to the non-commercial exchange of information, or even to commercial services involving no exchange of physical property, is the recent, and more immediately concerning, development.
> It would be nuts to ban the sale of guns inside a country…
I agree with you up to that point. But if they want to ban the import of "wireless handheld hold punchers" or any other contraband they should do that at the border, by stopping the shipments—which at that point consist of the buyer inside the country attempting to import their own property after the sale—and not by attempting to impose their internal rules on foreign sellers. Residents could buy them but would have to keep them outside the country, perhaps using them only while visiting the country the goods were in at the time of the sale, or somewhere else where they are legal.