2-step authentication
LMGTFY
It's past due to add a 2-step authentication.
By neglecting this feature, it leaves the players susceptible to security issues.
Android: https://play.google.com/store/apps/details?id=com.google.android.apps.authenticator2&hl=en ios: https://itunes.apple.com/gw/app/google-authenticator/id388497605?mt=8