You should make another post which explores private APIs and (undisplayed) data sent to mobile clients. For example, many (perhaps most?) delivery apps have an API endpoint which will send information about every single restaurant location within a bounding box to the client. You can often make the bounding box arbitrarily large to pull down a JSON list of every location and its metadata (like store hours, age, number of orders per day, menu, unique promotions, etc).