Google can't make money serving ads if you go to the ad-free python.org. Obviously I'm not saying they're singling out python or documentation in general as so

Google can't make money serving ads if you go to the ad-free python.org. Obviously I'm not saying they're singling out python or documentation in general as some kind of cash cow. More realistically the story is that, sites that serve ads make money, and can spend money on cat-and-mousing SEO to keep making more money. Technical docs aren't going to do that. Google could whitelist them but it seems they turn a blind eye for the aforementioned reason.