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a senior guy in this sort of thing
Ah yes - PAID can be a very big problem.Still: what is the format of the review? Is it all the same text, same anchor text leading to the same destination URL or is it more like customized reviews of different products having links with different anchors leading to different product pages?
Ever since Google became a registrar, they say they are not using the Whois data this way. There are many other "footprints" they use to find common sites to one owner.