My household probably gets 4-5 packages from Amazon a week. Over the past half decade, I've received maybe 2 obviously counterfeit products.

If I've gotten anything else that was counterfeit, it was a good enough reproduction for me not to notice.

But some people might be buying items exclusively in categories where the rate is higher? I don't know. I buy a lot of electronics and electronic accessories off of Amazon, and that seems to be what others complain about being bad.