I think it can't be solved by a search engine. If you search for conspiracy junk that's what will be surfaced. Attempts to correct for this will just introduce

I think it can't be solved by a search engine. If you search for conspiracy junk that's what will be surfaced. Attempts to correct for this will just introduce other biases until the search engine maker likes what they see. Introducing contrary content into search results will annoy users, and also surface fringe junk more frequently. A search engine is bias. If you wanted unbiased results, you would sort the results randomly. Maybe even return random URLs without regard for what was in the search query.