Was browsing through a whole lotta niche sites looking at their backlinks and I notice a lot of them have weird backlinks and anchor text. like links from warez forums, and anchors like "how to get free viagra"... most of the sites I was looking at had these links. I wonder how common is it that people do this to their competitors?... seems pretty dirty to me. Even saw one site that was a pillow review site their top anchor used was "ultimate guide to ranking a niche site with a pbn" ... weird negative SEO attempt?