android - Show Google Play Games Welcome Dialog on all app launches - Stack Overflow

The best example of what I am trying to attempt can be described by the behavior of the simcity app (and I'm sure many others that I may be unaware of also using the google sign in for Google play

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In-App Purchases with Flutter: A Comprehensive Step-by-Step tutorial, by M4trix Dev, Flutter Community

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Official - Tutorial - Authentication with Google Play Games - Unity Forum

Official - Tutorial - Authentication with Google Play Games - Unity Forum

android - When opening dialog activity, the launcher activity always shows below if in the stack - Stack Overflow

Flutter Tutorial for Beginners, All In One