Hundreds of millions of Pokémon Go players spent years filming the streets, parks, and buildings around them to earn in-game rewards. Those roughly 30 billion environmental scans are now owned by Niantic Spatial, and they helped train a camera-based navigation model that a U.S. defense contractor is preparing to put into drones and other military robots. Most of the players had no idea. The pipeline runs from a mobile game to the battlefield in three steps. Players scanned the physical world. Ni...