I wonder do FB buy user ad preference data from 3rd parties, that may in turn buy them from another listening app. If I was FB, I'd either process the audio on

I wonder do FB buy user ad preference data from 3rd parties, that may in turn buy them from another listening app. If I was FB, I'd either process the audio on the device to avoid network traffic, or buy the results from a partner, to keep the actual listening at arms length. It wouldn't be that hard to imagine another ad-tech company collecting the data in some other app and feeding the data back to FB. I can't imagine FB would be asking as many questions from a 3rd party as it would to internal teams.