Earlier quoted context omitted.
I think one of the fundamental things that make search work well about 1-2 decades ago was that web sites would link to each other, and that those links could vaguely correlate with reputation. There were link spammers, but there was actually a some decent organic content as well. What's happened since then is that almost all the normal "people linking to things they like" has gone behind walled gardens (chiefly Face…
Why has blogs and articles stopped linking to things? I'm reading a restaurant review site, and they won't link to the restaurant. The chef name is a link to a list of all articles tagged with the chefs name, rather a wikipedia link or something useful that can tell me who that person is.
Also if you are going to make a purchase somewhere, any website would try to get a cut of the money you spend by actually sending referral links to the product. So small websites that do not allow this service will not get linked so much.
On a metalevel it is thus that links or connections between items are information. Information is money. And as soon as that became evident links and connections also became more scarce.