“Free Internet Wifi! Thanks to the City Council!”
The sign went up on the outside of the library, explaining how the council wanted to help the kids get ahead on their schoolwork, and thus in the school grounds there was now free wifi.
It was, of course, extremely popular, and all the kids used it for their laptops and smartphones. Sure, there were some people outside the school who abused the privilege, but they were relatively few.
Just a great little idea and system. I got hundreds of pictures, records and other blackmail material, before the school worked it out…