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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.
All the assistants listen all the time for their codeword. The new pixel phone show you a list of songs played around them and more. It is already happening all the time in the background.
That's done locally. You can try training wake word models for any open assistant and see how much computing power it needs for even simple phrase.