Full screen ad problem
Full screen ads are fine. Full screen ads that have a timer til the x button appears are fine too. FULL SCREEN ADS WITH NO WAY TO CLOSE ARE NOT OKAY. The process in which you review the ads allowed in your app needs some work.
I also have a problem with full screen ads appearing right when you are doing something accidentally causing you to click it. I know that you are trying to increasing your click through rate and make more money but this is incredibly annoying and opens up all sorts of link. This is even more problematic when you don’t filter your ads for spam and the users end up opening spam links. If you were to incentivize watching ad (for example by bringing back see more users after watching an ad) it would be much more preferable.