But it's not in exchange for "a review", it's in exchange for a 5-star review. If the review isn't 5-stars, the person doesn't get their money. Amazon does off

But it's not in exchange for "a review", it's in exchange for a 5-star review. If the review isn't 5-stars, the person doesn't get their money. Amazon does offer a legitimate program for brands to offer free gifts in return for reviews, but it doesn't require those reviews to be positive.