Isn't Alditalk requesting registration with a German address before activating the card? In that case it might not be too easy to get this SIM for the persons residing outside of Germany.
Actually I do not understand under which premise the EU mobile operators can afford to reject sales to persons resident in a different country:
The EU claims: "You have the right to buy from a service provider located in another EU country without price discrimination and without having the seller refuse to sell to you simply because you live in a different EU country. However, if there are objective reasons for the seller to refuse to sell to you, that seller may be within their rights."
http://europa.eu/youreurope/citizens...s/index_en.htm
In the case of prepaid service where it is not possible to make debths and there is no real contract between the operator and the user I do not see any objective reason for this limitation.