So, i've seen this proposed, and i don't see why blurring or blacking wouldn't work. Safer, too.

Plus, I've told lies that idiots misread and followed back to truth before. The machine has to have the faces fed in, which means you're creating a duplicate record, and the extent to which the users of this technology never seem to understand it makes me... I don't trust them to not accidentally use the cloud, much less successfully maintain an air gapped machine.

Again; this is frivolous bullshit, black bars exist, so the people using it would be enthusiasts, and every single person I've ever met who id trust with that kind of risk for those kind of stakes would laugh you out of the room for suggesting it.