I would say that there is a massive leap to go from "an app will occasionally tell you someone in your general area ordered from X" to "stalkers download this s

I would say that there is a massive leap to go from "an app will occasionally tell you someone in your general area ordered from X" to "stalkers download this so they can stalk someone". "Neighbors" is a loose term. It doesn't literally mean only the people you live immediately next to. Aside from the fact that the person receiving the notification has no information about the radius this notification was triggered by, there would also not be identifying information in the notification. You're not being told "That person across the hall, John Smith, bought a large pizza from ABC pizza ten minutes ago and is on his way to pick it up now". A stalker would get no actionable information from "Someone in your area ordered sushi from XYZ". There is also no indication that this would be available in any sort of publicly scrapable API, I really don't know where you pulled that from. Push notifications, by definition, are not queried for.