What we are witnessing is the slow death of the free market internet we used to know and love.
By rights it ought to be the Slow Death of Google, but so far it isn't even a flesh wound.
The current results are dire. In my sector (which is specialised) Amazon are now coming top for general product searches. It is almost like having Amazon at number 1 for Space Recovery Vehicles, but those - like everything else you can't usually buy in a shop, including Brain Surgeons - go to Wikipedia.
Basically (depending on whether Google thinks you want to buy one or find out about them), either Amazon or Wikipedia are in first place, followed by an almost random hotch-potch of sites with no backlinks, no SEO and no content (peppered generously with black-hatters and then lightly dusted with a few completely off-topic pages).