As I understand it, it's a series of tubes... On a more serious note, it can be discussed when e.g. Google sells ad space to a German company which then advert

As I understand it, it's a series of tubes... On a more serious note, it can be discussed when e.g. Google sells ad space to a German company which then advertises in France, whether the business is being done in Germany, France, or both. But it sure ain't Ireland or the Cayman Islands...