ive an app in Closed Testing (only a few emails in my tester list), but I noticed strange gmail accounts signing up for my app! I have checked that my app is not found in Google Play Store (except when logged into a tester emaiL). Should I be concerned? Thank you
According to this article by the Google Play Team, this is normal. The Google Play store does some automatic testing of each uploaded app. If it finds a Google Sign-In, it will use a test account to sign up / sign in for the app.
Getting behind the sign in
The developers of our imaginary app care about keeping their users’ data safe and secure, so the app uses custom login or Google Sign-In. When the crawler sees a Sign-In with Google button, it uses a Google account included on the test device. If your app doesn’t use Google Sign-In, you can configure the pre-launch report with a test account username and password that the crawler will enter when it encounters the login screen.