It's disturbing because of how effective it could be. It's at OS level, anything you have on your phone can be scanned. Even if an app tries to circumvent it b

It's disturbing because of how effective it could be. It's at OS level, anything you have on your phone can be scanned. Even if an app tries to circumvent it by keeping files encrypted at rest it can scan them in-memory. And since it's all done client-side you'd never know it was happening until it found a match and sent it to Apple.