Sponsored by Amazon are literal ads, unless you’re referring to “Amazon’s Choice” which is more or less Amazon saying what the “highest rated” item is. Sounds like you clicked an ad.
This is why advertising on the web, social media platforms, etc, has a bunch of stuff you can and can’t do. Scam products are harder to police there and definitely happen, but a product in a web page or next to a tweet is less risky than a product in a list of products where they user has intention to buy one.
Amazon need to tread really carefully here. I know so many people who avoid eBay because of scams, it pretty much destroyed their reputation in the late 2000s, and Amazon is headed that way.