I'm curious about the cost overhead to run something like this. Consider: You have to have a database containing cryptographic hashes of offending material and

I'm curious about the cost overhead to run something like this. Consider: You have to have a database containing cryptographic hashes of offending material and keep that continually updated. That's fairly easy to do cheaply. Then you have to take a cryptographic hash f every single image being potentially loaded to iCloud and compare. I'm not sure what hashing they are doing but I wonder what the cost per 100,000 hash compare is. Then if a match is found the flag must be added to a database of...and I'm not sure about this...imei numbers? Or maybe just indexed by AppleID? If thirty flags are raised against an index j that database then that necessitates that a human must manually verify that it is, indeed, illegal pornography. That's going to get expensive.