Comment by cmiles74

The article isn't clear on this point, I believe because Meta isn't clear on this themselves. Other bits of this piece highlight third parties reviewing the responses of the AI assistant; it's possible that people are recording and some sound they make triggers the AI assistant which, in turn, leads to the video being reviewed.

OTOH, Meta could just be desperate for training content and they're just slurping up all recordings by people who've opted into the AI function. It would be great for them to clarify how this works.