There are two main features that cause concern. The one that has been getting the most attention and noise is the CSAM scanning. That only happens on upload of

There are two main features that cause concern. The one that has been getting the most attention and noise is the CSAM scanning. That only happens on upload of images to iCloud Photos (currently only in the US). No automatic notification of any law enforcement agency is done, and there is a threshold requirement before Apple reviews the account and then submits a report. The second feature is iMessage specific. Parents have to enable this on their account on behalf of their children, and it only applies to minors (_probably_ just children under 13, possibly older; I am not clear on that). This looks for (mostly outbound?) messages going to the child's phone for “unsafe” images (e.g., nudity). If those messages are found, _the parent_ is notified. No one else. I have _more_ concerns about the second feature as it is likely to be abused by controlling parents and is more likely to negatively impact children who are questioning their gender or sexuality. But this is _explicitly_ a feature to protect kids from sharing sexual images of themselves.