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It could be visually the same product but actually have different safety implementations

It could. But why would it?

Because what's stopping me from getting the same box and putting cheaper components and skipping all quality assurance and undercutting the original? Or even worse, taking the quality control failed items and selling them as working.

Is it unlikely? Maybe, but also it has happened enough times that it's probably worth paying attention here. Relevant on today's front page https://news.ycombinator.com/item?id=44638580

You misunderstood my point. Why do you actually think there are better quality components for $12 on Amazon than $4 on Temu? There's no accountability on Amazon either, so why would they care at all either and give you better stuff? Just to be generous?

There's definitely _more_ accountability on Amazon.

That's news to me. People are selling counterfeit everything on Amazon left and right, but somehow the people selling no name remote controlled relays are making sure they deliver a quality product. Interesting.

Reply on news.ycombinator.com