It must be doing some kind of personalization for you, because when I load those two links in an incognito window, the first page is made up entirely of links to the constrained domains. That differs from the parent's link which in an incognito window just displays some kind of bing-looking error message
Old black hat SEO. Was never in that industry too seriously, but I did keep looped in my tech news as a kid as it gave me another perspective on the growth of the internet