I recently watched a YouTube video where someone deliberately bought an obviously fake microSD card off of Amazon to demonstrate how Amazon is still full of these fakes, how to avoid accidentally buying one (the answer being: check the price compared to the price of brands you've heard of. If you're looking for a 512 GB microSD card for your Nintendo Switch or whatever and you see that ones from companies like Samsung and Sandisk are $30 to $50, then the one you see on Amazon by some brand you've literally never heard of for $10 to $15? Fake as all hell), and how to check the capacity of a microSD card if you're unsure if you've got a fake or a legit one (or if you're like this YouTuber and you deliberately buy a fake and wanna see what the real capacity was).
And anyways he left both a negative review of the product telling people it was fake and reported the product to Amazon for being fake and...
Yeah he got an email from Amazon a few days letter basically telling him 'Yeah thanks for the review and also for reporting the product as fake but uhh no it's actually legit so we took down your negative review because it's inaccurate' (AKA 'the person selling the microSD card was probably questioned about it being fake by some automated Amazon thing and just went 'No this product is legitimate. Look here's a screenshot of our microSD card in a computer, it says 1 terabyte. It's legit' and Amazon's automated process goes 'OK well you say it's legit, so it's legit'.