Pete Johnson wrote:
"The "Impressum" link on the leftmost part of the footer is mandatory for all pages focused on people within Germany...
Why? I have no idea"
You get the idea, when you encounter online-shops, which have no address or e-mail at all - often enough you encounter that not until something with your order goes wrong.
A shop without an postal address and other mandatory declarations could be closed very easy under the german top-level-domain ".de", because it's simply illegal.
For consumers, this is a good act. I claim that there is less e-crime in shops under the german-top-level-domain compared to many other toplevel-domains.
Practically, you will not find a shop in german without correct information in the impressum, at least not very long.