title: How to count to the number of users who disable ads
body: <p>I'm not sure how to explain it so I will give the context of what I want. </p>
  
  <p>I published android app and I put advertisement in it, but the advertisement is optional, I would like to keeping track of how many people enabled it and how many people disabled it. </p>
  
  <p>I believe I can use firebase events to count each time that users have disabled or enabled ads, but the problem is if people spam enable and disable ads, it will count it multiple times. A fix for it would be to subtract the number of times users disable ads from number of times users enable ads to get the number of users that enable ads. </p>
  
  <p>Are there any better approach to this? </p>