Such a system could be designed in a privacy-preserving fashion which might be a customer-valued property. Even better if it could avoid the toxic crap fed by Nextdoor.

For example: I considered writing an app that verified that a caller did indeed work for the company they claimed (have a facial recognition digest, send to company, get a thumb up/down, then discard the local data on thumb up).

There’s nothing to stop me from remembering the faces of people I’ve met; what’s creepy is that the machines know essentially everybody’s face. But the opposite can be true to: we could make machines that discard everything inessential. There’s just no customer demand for that yet.