My personal experience as well, but, y'know, plural of anecdote. The thought does cross me that maybe I just don't recognize it. Then, while it is unambiguously harmful to the genuine vendor, what is the consumer harm (assuming it is not just garbage, or like, toxic etc.)?

That being said, there is a lot of stuff on amazon I'm honestly surprised is worth the space it takes up in their warehouses. And I have knowingly bought some low-quality stuff on amazon. But perhaps with the critical caveat of knowingly, I have yet to have a counterfeit foisted upon me.