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I still don’t think companies serve you ads based on spying through your microphone
(simonwillison.net)
This is a most excellent place for technology news and articles.
A phone reacting to "ok Google" or the equivalent for the other assistants already requires to listen to what you're saying - doesn't seem to affect battery life all that much.
Passively waiting until a specific pattern of pressure waves impacts a sensor takes way less power than recording and transmitting the voice data