The box wouldn't be WiFi. That doesn't have enough bandwidth for the target results. It would be a wire or optical fiber, and it probably won't be a continuous stream of direct neighbors: people would run it across the street through storm sewers, string it up on utility poles, bury it an inch deep across the local park or unknowing intermediate neighbors, or even renting a trencher or pipe layer and installing it like a utility would... However they can get it. The data finds a way. Legally, those require permits.