I think some people here have similar feelings, but as other replies point out, this particular hash is not cryptographic and we have to trust Apple’s word for

I think some people here have similar feelings, but as other replies point out, this particular hash is not cryptographic and we have to trust Apple’s word for it that false positives are extremely rare. Also worth mentioning that the original corpus of data used to build the hashes isn’t inspectable, so we don’t know how much garbage exists on the input side. A recent blog post suggests that the corpus of CSAM isn’t even very comprehensive, so the value of this system is questionable.