The domination of WikiPedia is now complete. A search for the term SEO at Google today shows sub-pages from WikiPedia in both the first and the fifth position. If that isn’t a prime example of what actually “works” in Google these days, I don’t know what is.
WikiPedia has a ton of domain authority, followed by dense interlinked pages with lots of on-page elements. If any of these pages get internal links to them, it’s a closed casket funeral for competitors. Ever since WikiPedia nofollowed all of their links, they’re even more powerful than before. Google has finally gone completely overboard in their “trust” of WikiPedia, and it’s obvious that one website ranking for so many terms probably just can’t be a good thing.
I’m sure we’ll see more and more example of WikiPedia corruption as time marches on. You can’t really expect a resource to be human-edited and stay clean when the bias on commercial phrases is this obvious.