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not what Kagi doesKagi maintains a "non-commercial index (Teclis) and non-commercial news index (TinyGem)" [1]. They also "prioritize non-commercial sources," implicitly downranking monetized sites. (Also, you can manually downrank problem domains [2].)
My devices have randomly switched back to Google or DDG from time to time. The first thing I did was check my ad blocker was working--I was simply stunned by the amount of blogspam puke.
> No VC-backed or commercial search engine would do what OP is talking about
No ad based, i.e. free, engine can, not sustainably. A paid one obviously can and does.
[1] https://help.kagi.com/kagi/search-details/search-quality.htm...
[2] https://help.kagi.com/kagi/features/website-info-personalize...