What are the privacy guarantees for passerbys (non-wearers).

You can sue the wearers for reparations and to work with Meta to delete your data, perhaps

Zero… you can and will be filmed without your knowledge or consent and your private conversations will be used to train ever more invasive AI systems and profiles of you will be sold to advertisers and governments all over the world.

I strongly recommend making owners of these things feel incredibly unsafe and uncomfortable in social situations. I wouldn’t hesitate to break a pair when I get the opportunity personally.