SEO spammers will merely adapt and pollute the data sources used to train the models. Also, for now these services are spending a lot of money to capture the m

SEO spammers will merely adapt and pollute the data sources used to train the models. Also, for now these services are spending a lot of money to capture the market, but sooner or later they'll monetize by biasing results towards their paid advertisers. The end user isn't the customer, advertisers are.