The Remove Ads feature works differently depending on the platform that you're using (e.g. computer or mobile).
If you're playing on Web and purchased the Remove Web Ads, all 3rd party ads between moves are removed in the game. The exceptions are pop-up information to showcase new game features, updates, and some tips about the game.
If you're using Mobile and purchased the Remove Ads Feature, all 3rd party ads between moves and all banner ads are removed in the game for 30 Days. The exceptions are pop-up information to showcase new game features, updates, and some tips about the game.
The Remove Ads feature does not sync across your devices. If you have used your Mobile to purchase the feature, you will be billed after 30 days. However, you can enjoy the expiring Ad Free bundle for both iOS and Android if you use the same Email/Facebook credentials when you created your game.