I read this article on the BBC warning about fake illegal Iphone chargers.
www.bbc.com/news/technology-38167551
It turns out that Amazon do not take any responsibility for products sold on Amazon, so anyone can sell un-certified unsafe and illegal products, from sellers based overseas (often in China).
These sellers also send their products to Amazon warehouses in the UK, so it makes it difficult to spot, they don't register for UK or pay VAT, putting UK sellers out of business. www.ravas.org.uk
It seems in mad that this is allowed. If it was a retail shop then Trading Standards would have shut them down.
And yes I have brought a dodgy charger.