If you do not renew after your package expires, your app will be downgraded to the Free package. When your app switches to the free package, your advertising codes will be de-activated and the Admob advertisement codes of MobiRoller will start to work. To find out what changes will happen to your app in the free package after your package is finished, you can review the relevant article “What will happen to the app after the package is finished?“.
You need to own a package to earn revenue from your ads in your app. You can review the related article “How to Upgrade Package?” to upgrade your package.