All you need is a list of advertising keywords. Have the device treat those like wake words just like Alexa and then target ads to the device based on which words it heard most often.
This is but the most simple version, it's easy to elaborate from there.
Yeah but this is about saying kraft singles are not cheese. If someone points at your meatloaf and says "is that meat?" Are you gunna say "no"?
It is meat it's just meat with shit added. I mean if we include salt and pepper, I'm not even sure the last time I've had meat without something added.