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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.
I would agree with you about the frequency illusion effect IF it weren't something very specific and niche.
It is literally a thing that happens.
I have worked for an advertising company before (they hid that they were an advertising company) and you would be surprised how sophisticated and scummy ads can be.