I head a similar story, regarding people hosting some sort of CCC, on a smaller scale, but not in Germany. Basically they were hosting the whole thing in an ab

I head a similar story, regarding people hosting some sort of CCC, on a smaller scale, but not in Germany. Basically they were hosting the whole thing in an abandoned building that they were squatting, had somehow managed to get electric power but no internet connection. So they started scanning for wireless networks and find this network. They manage to get access, and they start configuring some services. Turns out, this person was not really int tech and had mostly default settings. There were some things that were not installed properly and the signal reception was not that good. Some of these people look up the owner credendials from the bills (some internet providers used to have you login to the billing website and the internet connection using the same credentials) and go ring to the address, pretend to be the internet company and start doing maintenance. AFAIK they installed a phone/adsl splitter so that the owner making and receiving phone calls would not drop the line for all the people leeching internet connection and also installed a stronger antenna (for free) which boosted signal for all the people leeching internet connection but also for the owner. Needless to say, they didn't left the new antenna for the internet owner as a present, even though they probably didn't even realize a single thing (also, they closed any security issue and revoked their own access when they left).