Follow up question - can we jailbreak this device and install an open source alternative that makes meta irrelevant?

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.

I am very much confused. People recorded sex way before the meta-spy-glasses.

I mean, not as if I were to visit such sites, right ... but video recordings can be done in numerous ways. Also on small devices. I mean the smartphones are fairly small.

Camera is recording/taking a picture