https://www.theregister.co.uk/2019/09/23/google_voice_assistant_settings_more_transparent/

Google has laid out what is and isn't recorded when you use your voice to operate its Assistant app, and tweaked some of its preference settings labels to be more upfront about what happens to your audio data. It also said sorry – again.

A blog post today from Google Assistant senior product manager Nino Tasca, headed Doing more to protect your privacy with the Assistant, outlines the new policy for what happens when you utter the words "Hey Google".