But thinking from the first principles, do you really think that all this phonetic keyword spotting[1] IP developed for defense tech in the late 90s and early 2000s was abandoned once recording entire phone conversations and doing full speech to text on them became technologically possible?
I still remember lots of startups who did this stuff openly a decade ago, before Cambridge Analytica scandal[2]. After that it became impossible to get funding or get acquired, so the few that stayed in this field became very secretive.
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[1] https://en.m.wikipedia.org/wiki/Keyword_spotting
[2] https://en.m.wikipedia.org/wiki/Facebook%E2%80%93Cambridge_A...
