I just had an argument about this with Amazon support. They took down a review for an item where I mentioned that the manufacturer included a card in the item's box offering to pay you for reviews. Apparently my review violated their "advertising" policy
I had a similar experience recently because I called out that the name brand webcam was not in retail packaging. That was the last electronics purchase I’ll likely ever make from Amazon. I ended up returning it and actually found one at Best Buy a few days later.
My favorite rejected review was for 6 slate coasters that arrived as slate chips because they were shipped in a large envelope with no padding.