Arguably we need half a dozen operating on adjacent principles, to fight against engine-specific SEO exploits.
"SEO is a $100 billion industry" = your opponents have a 12 figure war budget.
This is what killed search more than anything else - people actively working to get their results higher than they would have been under "normal" conditions.
This is what killed search more than anything else - people actively working to get their results higher than they would have been under "normal" conditions.