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Just a thought, maybe they are using a "nuke from orbit" approach? Spam forums with both high and low rankings and skeptical users and non skeptical. The ones with a high SEO ranking appear in Google/Bing/DuckDuckGo results making it seem like they are effective, but we don't see the smaller forums they attacked because they have a low page rank. Forums that have people who aren't tech savvy fall for this while tech savvy forum users are mildly annoyed.