My guess would be that the ad network they are using doesn't give anything for German views/hits. So they are saving on traffic costs.
If it were the case that they have some local brand (as is the case when you can't buy music/games/etc online), it would probably redirect somewhere else as Google.
If it were the case that they have some local brand (as is the case when you can't buy music/games/etc online), it would probably redirect somewhere else as Google.