Hi LeonTheremin,
the issue is about physical borders. We can not solve them and just have to accept and life with it.
However today the LNNs change a lot, cause for example if you have Wlan signal run times and Walls and a Camera with known position in Addition to a Picture of that room. You have a LNN which can extrapolate the moving humans using and not using digital Devices in that Area through walls and collect that information to sell it elsewhere.
Eric Schmidt in the past dreamed of a Kill-Switch for his self Privacy and to hold the wheel of progress… its like everything it has pros and cons, but for humans you have to share it to disclose this secret world to public, or teaching it in primary school.
Often this technology scare us… but we have to accept it.