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If you didn't buy fake reviews but keep getting them there are usually three reasons:

- Negative reviews: your competitor trying to screw you.

- Positive, but obviously bots: your competitor trying to make it seem as if you are buying fake reviews to screw you.

- Positive or neutral/negative, but high quality: review farm building up account history to make the reviews they plan to sell look more legitimate.

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I think the fourth reason that has been discussed here and in Jeff's post also sounds plausible:

- somebody wants to push his app with fake reviews, however that would be easy to detect / trace back. Thus that person buys additional positive fake reviews for other apps (that are not in competition with his apps). This makes it really hard to tell which of the apps "purchased" the fake reviews.

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