I wonder what happened? Did they hit the usage limit? Were they contacted by Google in order to use the Business version (even if it's Christmas and no one is at work)...
"Google has disabled use of the Maps API for this application. This site is not authorized to use the Google Maps client id provided. If you are the owner of this application, you can learn more about registering URLs here: https://developers.google.com/maps/documentation/business/gu...
It's probably a case where the dev API key was pushed live instead of the correct key for vw.com