Can't go into details, but imagine the kind of places the city doesn't touch anymore. Those out of the way locations where few, if any people go ever. Maybe they never have sicnal. Maybe the locals have stripped that ad tech down over the years. Maybe neglect has broken it down.
I love @ignore, but sometimes I'm in an area where I feel it doesn't make sense to have NLM influence at all. And it feels just a tiny bit immersion breaking.