A lot of complaints here. I personally never had any problems with Amazon (Germany). I might not have noticed that I received counterfeits for certain products, though. Does the shady stuff only happen in certain countries?
Still, amazon weights the 5-star no text reviews higher to arrive at 3.5 stars.
(The product now has 7 reviews with at least 3x 1 star text reviews and the weighting still favors the no-text 4/5 star ratings: [1])
[1] https://smile.amazon.de/Lego-Technic-42125-Ferrari-Corse/pro...