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You were answered by one of the moderators here:
Instead of posting again, please answer PummyRaj in the post above, by pressing the green "view post".
However I can also answer your question: King divide players into test groups, some get ads, some don't. Those with ads sometimes lose them, but they might get ads back at a later date.
Beware: Anyone who spends money on the game will automatically be moved into to the "no ads" test group.