Reasons mentioned: SEO is winning, being an advertising company is contradictory to being a good search engine, people and content moving into big silo sites some of which are deep web, greater ease of just producing a giant amount of autogenerated sludge and sites and Google trying to be too smart.
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If you want more to read this has been discussed extensively for at least 2 years: https://hn.algolia.com/?q=search
Reasons mentioned: SEO is winning, being an advertising company is contradictory to being a good search engine, people and content moving into big silo sites some of which are deep web, greater ease of just producing a giant amount of autogenerated sludge and sites and Google trying to be too smart.