prominent placement of Wikipedia as the top result for most searches, to give one example, certainly isn't a happy coincidence.
If Google is manipulating results to favor Wikipedia, that's a whole 'nother bombshell.
Wikipedia has consistently ranked among the world's top 5-10 websites (according to Alexa and so forth) for 10+ years. It's the first place most people look (typically via Google search) when they want to know some random factoid. Why shouldn't it be the top result?