Most of it is just misinformation. People think the images are realtime. They think you can move the camera to go to places and e.g. look into windows to see what your neighbour is doing right now.

The other part is irrational fear. Fear that thieves will use 2 year old images to check out a house, fear that some potential employer won't hire them because you apartment complex looks shitty (Some Germans really like their house fronts - contrast that to the France that most don't care at all what it looks like from the outside, as ling as it's attractive from the inside).

So yes, it's a German thing.