Google maps is definitely filled with spam businesses. I am in digital marketing for side projects, and there is a whole underground industry right now that is teaching people how to game Google Maps to appear as real businesses. It's stupid easy to get "verified" on google maps as a real local business, even though you could be several state or continents away. I've often wondered when google is going to crack down on this kind of thing, but for now, it's still wide open.