So apparently Niantic’s apps leak enough information that you can easily stalk people through Ingress and Pokémon Go. You need a third-party client to do it, but that tells me that arbitrary clients have access to info that shouldn’t leave the server. https://www.kotaku.com.au/2017/11/ingress-players-use-unofficial-tools-to-stalk-one-another/
@tom I love to software