[kickopotomus]

> Those images won't be flagged because they aren't in the database provided to Apple

This is not accurate. Apple is using perceptual hashes. If the features of an image are close enough to an image in the NCMEC database it may generate a matching hash.

[yakkityyak]

Not defending the new tech by any means, but you'd have to have enough matches to exceed some hidden threshold, which would first trigger a manual review by Apple. It seems very unlikely to have your own family photo result trigger anything.

[ByteWelder]

The problem with that is that the threshold is unknown, so it could be 2 or 3.