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There is no innate reason why a Google search on a subject should return high quality results. This is predicated on there being someone willing to write thoughtful, informative, well-researched content and post it on the open internet such that a search engine can monetize that content via user profiling and advertising.

There may have been a moment when enough people were willing to put up their writing/images/videos for free such that Google's search engine appeared helpful in "organizing the world's information". But that mission statement was is a smoke screen. Google didn't organize. The company, as a gatekeeper, profiteered off of the writing/images/videos of others.

The problem isn't that Google search algorithms are low-quality, nor that Google has been gamed by SEO. The problem is that Google has engaged in a scorched-earth policy of capitalizing on the work of others. Google created a secondary market in information, without funding the primary market -- which then withered. And now there is a tertiary market of SEO spammers capitalizing on the propensity people still have to think that a Google search will return the truth to them, gratis.