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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.
That article covers a pitch deck by an ad agency with absolutely zero detail of how it works.
If this is happening, it should be easy to test.
https://variety.com/2023/digital/news/active-listening-marketers-smartphones-ad-targeting-cox-media-group-1235841007/
Apps still need mic permissions to do so. Many Android ROMs include notices when the mic is being used, it would be very easy to tell if an app was actually doing this.