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Hey there, welcome to the forum; but it seems like you're no longer part of an experimental test group (of guinea pigs) that has the feature, see here.
Some will get adverts & others won't, different people get different features.
Since you've already made a purchase within the game, the experiment has concluded for you; here's an example from another unfortunate player.
But do not delete the game in an attempt to restore the feature (unless you plan on quitting), as any accumulated boosters/received game lives would also be deleted; see this.
If anyone can cite any similar incidences where the feature has been restored after making a purchase (to reassure players), feel free to post about them here (come on down).
Guinea pigs, such adorable little creatures...