title: is it ok to hide admob banners after user click?
body: <p>Is it ok for android application to hide admob banner after user clicks it?
  I.e. user clicks it, returns to application and banners are hidden there (e.g. for 1 hour).<br>
  Can it be treated as violation of admob rules? Something like - encourage clicks.</p>
  
  <p>And if it's not ok then how to protect application from high amount of clicking by strangers..</p>