I don't track where the app itself is being used. But I have to store the locations of the reactions to share back to the requester. I happened to find out apple's location simply because they were the only ones to use the app (apart from my tests).
But I don't keep any personal data (the app doesn't require mail/registration/identification etc.) hence it is impossible to connect any coordinates in the database with an existing individual.
On the surface, interesting. Under the surface, it makes me want to be sure to avoid your apps in case I show up somewhere "interesting" enough for you to post on Twitter. :-(