I've made 140 Amazon orders in 2020 alone. Probably a third of them cycling related, everything from cranksets to tires to bar tape. There are countless legit sellers operating in the marketplace, like Gap30Cycles, Planet Cyclery, USAmade, Prestacycle, Bicycle Addiction, and on and on.

No matter the seller or the item, if they're bought through Amazon, it's covered by the A-to-Z guarantee. I've never gotten a questionable item through Amazon, ever. I've probably had to make ~20 Amazon returns over the years and never had a single issue with any of them.