Do you all really think that if this contributed a measureable portion of ads that it wouldn’t leak? There’d also have to be a large amount of hardware dedicated to speech transcription—running constant speech to text on every google chrome browser would need so much compute.
Not to mention that it’d be possible to actually show that the company was lying by modifying microphone drivers and showing that they activate in the background. I’m pretty sure you could also just do it the same way they make game hacks—get access to chrome memory and show that there’s sections that match the recorded speech.
Indisputable proof that this happens would be a PR disaster for either company and cause legal action too.
I’m really in dismay at how long this myth has persisted.