You can turn off video autoplay to reduce data usage in Google Play Games on Android phones.
How to turn off Automatically play videos in Google Play Games app on Android phone
To turn off Automatically play videos on Google Play Games:
- Tap on More options (3 dots at top-right) and select Settings.
- In Settings, under General, turn OFF the toggle next to Automatically play videos.
Currently, I am using Google Play Games app version 2022.01.32371.
So these settings may be different in different versions.