[0x426577617265]

If the process of identifying the images is done on the device, then a jailbroken device will likely give an attacker access to the entire DB. I'm not sure how useful it would be, but if the attacker did have access to actual known CSAM images it probably wouldn't be hard for them to produce false positives and test it against the DB on the jailbroken device, without notifying the company.