There are always scenarios that one cannot catch. EFF highlights one such. It sounds like it could be quite common. And it could be an absolute nightmare scena

There are always scenarios that one cannot catch. EFF highlights one such. It sounds like it could be quite common. And it could be an absolute nightmare scenario for the kid who does not have the feature turned on. This means that if—for instance—a minor using an iPhone without these features turned on sends a photo to another minor who does have the features enabled, they do not receive a notification that iMessage considers their image to be “explicit” or that the recipient’s parent will be notified. The recipient’s parents will be informed of the content without the sender consenting to their involvement. Additionally, once sent or received, the “sexually explicit image” cannot be deleted from the under-13 user’s device.