Whatever you speak to your Google Assistant for example Google Home is now said to be heard by Google contractors. Read more at technologydecisions.com.au
Google has claimed that it reviews only a small percentage of audio recordings in order to enhance speech technology.
Google's terms include that they have the right to access voice recordings in order to improve and develop the services of the company. Google contractors focus on just the audio and cut on the background sounds if any. However, some recordings have contained sensitive information too.