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> by creating an SEO industry that's 100% focused on optimizing for their ranking signals.

The SEO industry will optimize towards ranking on whatever search engine people are using

This is why my dream search engine downranks pages with advertising on them. Optimize away! :)

It would be a lot harder to do if the market had more viable competitors. In a world with 5-6 dominant options and a long tail of niche search engines you'd probably have options that penalize blog spam, aggregators like pinterest and sites with paywalls or millions of ads / affiliate links.

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