Hardly a danger. Amazon store is filled with counterfeits and scammers due to its comingling policy.
When you buy from a small shop where its reputation is on the line, you're assured you're getting what you ordered. When you buy from Amazon, it could be comingled scammer-goods from that one guy who ruined the collective commons for everyone.
Its clear how Amazon works. They merge SKUs together, and "Fulfilled by Amazon" means those goods are comingled with other marketplace sellers (possibly even "Sold by Amazon"). It only takes one bad actor in the marketplace for counterfeit goods to be mixed up with everyone.
Most people don't know that the Amazon stores have counterfeits and they don't care because they will almost never actually get one. I place close to 100 orders a year and have yet to receive a single counterfeit product, or at least, one that substantially differed from the product advertised.
The most counterfeits come from books in my experience.
There seems to be counterfeit printers who will give lower-quality books (runny ink, editing errors, etc. etc.). This is a bigger deal for $100 to $200 textbooks. You're gonna get a lower quality product than the official printers if you buy enough books on Amazon.
No Starch Press was also complaining about it pretty loudly, but Amazon never made a response as far as I'm aware.
I've caught counterfeits of my own. Ligatures (ex: fi or fl) are completely missing from my Art of Electronics 3rd Edition... so my table-of-contents says "ip-ops" instead of "flip-flops". Among other multitudes of errors that is in no errata that I'm aware of.
I believe lots of those counterfeits are actually pretty hard to tell apart from the real product. I've had a Samsung charger that was almost a perfect copy, I wouldn't have noticed it if hadn't started smoking one day because the insides were melting together into a burned mass. There were some details (quality of the printing etc.) but nothing I'd ever have noticed. I've also had a Shimano MTB chain that wore out in 1/20 of what I usually get out of a chain. Not sure how many "this product is kind of disappointing" situations I've had that were actually due to fakes that weren't obviously fake garbage, but kind of ok-ish.
When you buy from a small shop where its reputation is on the line, you're assured you're getting what you ordered. When you buy from Amazon, it could be comingled scammer-goods from that one guy who ruined the collective commons for everyone.
Its clear how Amazon works. They merge SKUs together, and "Fulfilled by Amazon" means those goods are comingled with other marketplace sellers (possibly even "Sold by Amazon"). It only takes one bad actor in the marketplace for counterfeit goods to be mixed up with everyone.