Extraordinary claims require extraordinary proof. All you example proves is that Google and Bing follow different metrics for relevance -- Google's being more

Extraordinary claims require extraordinary proof. All you example proves is that Google and Bing follow different metrics for relevance -- Google's being more relevant for someone looking for the former subreddit that was widely discussed in other media outlets, Bing's being more relevant for someone looking for the current incarnation i.e. dedicated Trump supporters. The idea that there is some conspiracy within Google to promote Trump's opponents needs more proof than that.