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Hundreds of smartphone apps are monitoring users through their microphones
(www.the-independent.com)
This is a most excellent place for technology news and articles.
Among other things, sure. More simply, keyword analysis.
All of these "models" are useless garbage but it doesn't stop them from trying to absolutely cram them everywhere they can.
None of what they do is "necessary". They could just ask you what your relevant interests are and you could tell them, but they do it anyway. They go to great lengths for any seemingly insignificant amount of data they can get their hands on.