Google might be eavesdropping more than you had originally imagined, though not on purpose.
Since June 2015, Google has been storing personal data on its users on a website, where users only have access to their own information. The feature works a bit like a digital diary, storing web searches, YouTube history, and (you guessed it!) Google Voice Search history.
That is a pretty nice information stored in there. Google must have been surely using this information to develop an AI to spy on whole world.
Good thing I've used google now about three times in total.