I fail to see what Amazon's motive would be for investigating brushing.
It would require paid staff time. It would reduce their sales, and associated fees. It would reduce the number of reviews, further reducing sales. It would reduce the number of sellers.
I think I recall some web site which tried to identify phony reviews. Not sure if they ever made it. Maybe someone on here has an update.
But I'm pretty sure you won't see Amazon cracking down on this anytime soon.
It would require paid staff time. It would reduce their sales, and associated fees. It would reduce the number of reviews, further reducing sales. It would reduce the number of sellers.
I think I recall some web site which tried to identify phony reviews. Not sure if they ever made it. Maybe someone on here has an update.
But I'm pretty sure you won't see Amazon cracking down on this anytime soon.