Facial recognition is the line in the sand. Several cities (San Francisco, Boston, Minneapolis) have banned government use of facial recognition. But private home use is unregulated. Is it a violation of your teenager’s privacy for the doorbell to log every time they come home late? What about your guest who has a protective order against a stalker—do they know your camera is logging their face?

But as these lenses multiply—nestled in doorbells, perched on ceilings, and hidden inside air purifiers—a silent trade-off has emerged: