Posted by rjonesx.Existential threats to SEORand called "Not Provided" the First Existential Threat to SEO in 2013. While 100% Not Provided was certainly one of the largest and most egregious data grabs by Google, it was part of a long and continued history of Google pulling data sources which benefit search engine optimizers.
A brief history
Nov 2010 - Deprecate search API
Oct 2011 - Google begins Not Provided
Feb 2012 - Sampled data in Google Analytics
Aug 2013 - Google Keyword Tool closed
Sep 2013 - Not ...
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Google's War on Data and the Clickstream Revolution
moz.com/blog