It's not a myth though. After GDPR and Google added the new privacy tools to their accounts I was able to hear the audio files it had "accidentally" recorded of

It's not a myth though. After GDPR and Google added the new privacy tools to their accounts I was able to hear the audio files it had "accidentally" recorded of me. Usually I just heard ambiant noise like computer, media, some distant talking. My naive assumption was that it had misfired on "OK google" and recorded for a few seconds to see if I'd give it a command. I've never opted-in for any OK google type service or device but I did own two vanilla Pixel devices. I've since opted-out of such recordings and it appears that Google has made no more recordings of me since then.