This is a case where I posted in a rush. The basic idea that Google's ranking algorithm is optimized to serve Google's interests first and those of its customers second is the only possible way for Google's officers to fulfill their legal obligations to the shareholders they serve.
The key to understanding this idea of the best search ranking algorithm is that people who query Google's search engine are not Google's paying customers. Google Search's paying customers are almost exclusively advertisers.
The best search results Google can produce are those which maximize their revenue. Not enough traffic directed to ad buying customers and advertising dollars may go somewhere else. Sure too much obvious selling might drive queries elsewhere but the threshold for tolerating advertising keeps going up. So many people take tracking across sites for granted that Google can push a "weather" search onto an advertising affiliate's site and still meet the expectations of the data point making the query. There is no objective reason other than income for ranking secondary sources above the primary source, "weather.gov".
Occam's razor just cutts that way.