Google wants every site to buy ads, so they engage in everything possible from adding dozens of ads on pages, to demoting entire niches, to FUD to force you to

Google wants every site to buy ads, so they engage in everything possible from adding dozens of ads on pages, to demoting entire niches, to FUD to force you to advertise. When Google has ads for a certain keyword, they don't care much about "organic" results, they care that ads are better. In fact, several threads at Webmaster World have shown a lot of obvious examples where Google makes results worst to have a better adclick ratio. Everything Google does is to make money via ads, from Chrome to Android to Search updates, especially during Larry Page's rein. That is the bottom line, the rest is fluff. Google Shopping is already 100% ads, the rest of the commercial results is 99% ads and advertiser sites (usually huge brands that spend billions on Adwords). Disclosure and ethics however aren't Google's strongest points, lobbying governments is.