[Zak]

Legal jurisdiction does not work that way.

Let's say Iran passed a law saying that it's illegal for anyone anywhere in the world to supply alcohol to a citizen of Iran, and that anyone selling alcohol must verify that their customers are citizens of not-Iran. When they attempt to enforce that against a German beer hall, they'll get laughed out of German court. Selling beer to adults is legal in Germany, no matter where they're from.

Likewise, the EU has no ability to enforce laws against American companies that don't have a physical presence in the EU.

[throwaway413]

IANAL. This is not the case.

Your analogy would be accurate if it went something like that beer garden in Germany decided to start selling beer online, and began taking international orders, including ones from Iran.

Your physical presence on the web is irrelevant. By putting yourself, or your business online, you are subjecting yourself to whatever regulations exist in the place your user is accessing your product.

As stated elsewhere here - enforceability is another topic.