Compare the approach Apple floated in their CSAM white paper to what Google is already doing today.
Google:
Is scanning for images of any naked child (including images of your own children that Android automatically backed up) and reporting parents to the police for a single false positive.
https://www.nytimes.com/2022/08/21/technology/google-surveil...
Apple's proposed system:
>Before an image is stored in iCloud Photos, an on-device matching process is performed for that image against the database of known CSAM hashes.
The device creates a cryptographic safety voucher that encodes the match result. It also encrypts the image’s NeuralHash and a visual derivative. This voucher is uploaded to iCloud Photos along with the image.
Using another technology called threshold secret sharing, the system ensures that the contents of the safety vouchers cannot be interpreted by Apple unless the iCloud Photos account crosses a threshold of known CSAM content.
Only when the threshold is exceeded does the cryptographic technology allow Apple to interpret the contents of the safety vouchers associated with the matching CSAM images.
https://www.apple.com/child-safety/pdf/CSAM_Detection_Techni...
Apple designed a system where they don't know anything about the data you upload to their server, and where they don't do anything at all about positive matches, until you cross the threshold (later revealed to be 99 images) that match against the database of known kiddie porn.
Even then they have a human review the images you shared before taking further action to protect against the possibility that there might be 99 false positives on a single account.
vs.
Google's system where taking a picture of your own child at the request of your doctor can result in Google reporting you to the police for a single false positive and deleting your account with no human in the loop.