Amazon calculates a product's star ratings based on a machine learned model instead of a raw data average. The model takes into account factors including the age of a rating, whether the ratings are from verified purchasers and factors that establish reviewer trustworthiness.
I love UDY deodorants and that was the simple reason I wanted to try their perfume too. However, unlike deo, their perfumes are not great. Smell is decent but doesn't last long. I feel cheated why I had spent 700 bucks if it just suffices the purpose of deo. Overall unhappy with purchase. Not sure on authenticity of the product