That's actually a pretty egregious violation of Amazon's Seller policies -- if you report it to Amazon, they'll get their seller account blacklisted.

There's one or two power people in the Fulfilled by Amazon world who do podcasts/vlogs, and they were telling the people who subscribe to their podcasts to start stalking/tracking down the people who purchase their products and start calling them to ask for reviews.

Needless to say, it backfired when Amazon started cracking down on it...