Concerns raised by privacy advocates got fueled by reports of Google home devices recording audio even when they are not actively used.
source: https://www.techtimes.com/articles/262271/20210701/google-ai-assistant-records-company-admits.htm
archived source: https://wellthissucks.xyz/2021/07/01/google-assistant-records-audio-even-when-youre-not-using-it-archived-source/