We are rapidly approaching that point. Apple is/was/will going to enable on-device scanning for someone's definition of naughty. Not hard to imagine that naughty will soon includes images of Winnie the Pooh, union formation, abortion, minority group X, what have you. Automatic notification of the authorities to follow.
Edit: To be clear, I am obviously opposed to CSAM, but on-device scanning is a privacy violation. Nobody knows what hashes trigger a flag, and they could be updated at anytime without the user being aware.