If this wasn't a joke, this would be way wrong. This article is so focused on the computer aspect of getting away with this that they forget the physical world. There is such a thing as a camera and if your going to be going about installing this at enough locations to be meaningful, enough information will eventually come out to get you caught. Moreover, once a device like this began to scare people enough to enter the news, people would find it near the hotspot and its threat would be neutralized.