Comment by iamnothere

It’s just a metaphor and it breaks down if you dig into the specifics too deeply, as with all metaphors. But if you insist, I as the seller am not responsible either. If I’m a bookseller and I send a banned book to you via UPS, after you paid me in person in cash, and your customs seizes it, you don’t get your package and nothing happens to me. YOU might get in trouble though.

Now if I keep sending banned materials to your country, it might be a bad idea for me to travel there. But nothing else is going to happen, unless you’re a global power and you drone me or compel my government to extradite me. (Or if my own country was foolish enough to make mutual extradition agreements for such things.)

(Note, I specified in person in cash above because as I mentioned before, electronic payments make things messy. But most websites are “free”.)