> the Amazon seller I used is listed

If it was "fulfilled by Amazon", it doesn't matter what seller you chose, you could have been sent a counterfeit item from another seller.

Sellers using fulfillment-by-Amazon send their stock to Amazon's warehouse, where it gets thrown in the same bin as all the other stock of that item from everyone else selling it. When it gets pulled to ship to you, there's no guarantee you get one that came from the authorized seller, versus a counterfeit someone else sent in with the same SKU.

Sellers can opt-out of commingling inventory at extra cost but most don't. Given you got a proactive refund, that seller probably has commingled inventory with everyone else, and Amazon is worried they sent you a fake that'll get someone injured and cause them liability.

Seriously? I am very surprised. Surely Amazon cannot ignore this counterfeit product problem. Doing this looks like opening an avenue for litigation.

They've been ignoring it for years.

Are they actually liable? If so, we should have seen class acts by now no?

That's what I would've expected too, but it seems not. Then again, if you still have eyes after this event you might see others filing class acts afterwards.

Mandatory binding arbitration. You may not sue amazon in a court of law.

Binding arbitration is generally not allowed with respect to product liability suits, except in the Eleventh and Fifth Circuits.

I've gotten counterfeit body wash (Shiseido Super Mild) and counterfeit microSD cards off Amazon, and, ironically, the only things I buy off amazon.com now are books, because if they're counterfeit, it'll be obvious, and it certainly won't cause me any harm.

Everything else I'd rather buy from the manufacturer (and pay the full, unsubsidised shipping cost -- not Amazon Prime) or a reputable distributor (digi-key/mouser for electronics, CS Hyde for films/tapes, etc). The prospect of having my eyes fried because of counterfeit PPE is kinda horrifying.