I have a solution: search engine which uses machine learning to score the "commercialness" of a page. By commercialness, I mean: is it a table of products with prices; does it have buy buttons; does it use a lot of tracking and analytics; does it have a cart; is there a lot of product talk (and is it overbiased positively); how are all the pages within a couple link-degrees scoring; ... (and more). Then, give users a slider which right side means no filtering, left side means basically only return universities, Wikipedia, and PBS tier results.

This has to track number of ads and trackers in a page and not just be about product pages. This measure should also fight SEO spam, as the tracking and advertising elements would cause SEO spammers to lose rank on the engine (disincentivising an arms race).

Add in the patently obvious need for the poweruser's 2nd search bar, which takes set notation statements and at least one of a few popular powerful regex languages, and finally add cookie stored, user-suppliable domain blacklists and whitelists (which can be downloaded as a .txt and reuploaded later on a new browser profile if needed). I never ever want to see Experts Exchange for any reason in my results, as an immediately grasped example. Give the users more control, quit automagicking everything behind a conversationally universal idiot-bar!