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Hey there, so it's your first post (& perhaps a lot of lurking) after two years; good on you for that willpower.
But it seems like you're not part of an experimental test group (of guinea pigs) with the feature, see here.
Some will get adverts & others won't, different people get different features; so you just have to deal with the experiment for as long as it lasts, but (try to) have fun.
And do not delete the game in an attempt to receive the feature, as any accumulated boosters/received game lives would also be deleted (if playing via mobile devices); see this.
You're basically at the mercy of those tasked with maintaining the game on whether or not you ever get the feature.
But once you make a purchase within the game, don't count on it; here's an example from another unfortunate player.
Guinea pigs, such adorable little creatures...