I am developing an android app with firebase(auth, firestore, cloud, storage), still in prototype phase. Because I need to test Google Play Billing library for subscription functionalities, I published the app via internal testing in Google Play. I did that, however, few minutes after app was released (internal testing), I noticed some weird accounts being created in my firestore auth section, which were not generated by me or any other internal testers. This accounts are of course not on my testers list.
I believe they were generated by google somehow, cause there's a login with google functionality implemented in my app.
Does anyone has an idea of where do they come from. Some time ago I did some research and I think someone mentioning something about autogenerated accounts, but am not finding anything related now. I need to get rid of them, cause I am "copying" each new account in firebase auth to a firestore collection - users, and am using some data further in my app. If anyone has an idea where do they come from or how should I not allow them (maybe some keys) or catch them automatically before they get "copied" to firestore collection.