2) I can’t control what ads show up in my app
App publishers are justifiably concerned about what ads show up in their app, so we’ve taken steps to ensure that your app will only serve ads that meet the guidelines you’ve set. Our ad controls allow you to set a maximum content rating level or block ads by category, ad type, URL, and more. Both of these controls can be applied to a single app or to your whole AdMob account.
For example, applying a maximum rating of G to your account ensures that only G-rated ads are served across all of your apps. However, you can simultaneously set a maximum rating of T for a specific app to allow it to include PG and T rated ads as well. For even more control, our Ad Review Center allows you to review individual ads on a creative-by-creative basis to decide whether you want to continue serving them. We’ve designed these features to ensure that you only serve ads you feel are appropriate for your users.