AdMob has a policy that limits the number of ads that can be shown to users in a given period of time. This is known as the ad serving limit, and it is in place to help prevent users from being overwhelmed by too many ads.
The ad serving limit applies to all AdMob accounts and is based on the number of ad requests made by your app. AdMob has set the ad serving limit at a level that is intended to ensure a positive user experience while also allowing app developers to monetize their apps effectively.
It’s important to note that the ad serving limit is not a hard cap, and it is possible to show more than the specified number of ads in a given period of time. However, if you consistently exceed the ad serving limit, your account may be flagged for review, and you may be required to take steps to reduce the number of ad requests made by your app.
You can find more information about the ad serving limit and how it works in the AdMob documentation (https://developers.google.com/admob/android/quick-start#ad_serving_limits).