If you're currently into researching sqlite questions and it happens you prefer one sites explanations, it likely comes up in the first few pages of a result of new questions on sqlite. By looking into bookmarks and history the users preference is clear.

In general you're right as in: most often in the first few result pages, there is no hit of sites you prefer. I think an extension that lists the most popular pages that have user-agency to the top can already help without curated blocklists: rank wikipedia, stackoverflow sites, github and reddit to the top.

There was a Show HN for "hypersearch" in 2022 that did something similar but in a sidebar - https://github.com/abhinavsharma/hypersearch