you know what that makes sense so I looked into it, one method of detecting csam is hashing the image and comparing it to a database of hashes of known csam images. so I guess that method might not work for “original” csam images.
apple csam detection [download]
interestingly, Google says they use AI also but didn’t really get into the details.
my gf’s mom ended up a firefox user because it had the cute fox logo, she didn’t even know what it was called