The Apple customer from the Heise report linked here, who had problems after moving, has since been contacted by Apple and is now allowed to play his songs in Canada after all (and also access his account, but can't make any new purchases).
His conclusion is similar to what I wrote in the comments to my post: DRM creates a very poor position for the customer. He therefore no longer wants to buy DRM-protected media.
The question is how much longer DRM-free alternatives will continue to exist...
At algorhythm there's the original article.