Your blog post appears to be conflating Google Maps with MyMaps. MyMaps lets people create & publish their own maps with random POIs: for example, here's a map

Your blog post appears to be conflating Google Maps with MyMaps. MyMaps lets people create & publish their own maps with random POIs: for example, here's a map of nice wineries around Melbourne. https://drive.google.com/open?id=1mtgpe7JU9OtHUUdvG_A6Uq0eTpQ&usp=sharing https://drive.google.com/open?id=1mtgpe7JU9OtHUUdvG_A6Uq0eTp... However, these do not show up in the "main" Google Maps, and adding spam to them isn't any more effective than adding spam to a random website. Disclaimer: I used to work at Google Maps.