"Apple said that while it does not have anything to share today in terms of an announcement, expanding the child safety features to third parties so that users are even more broadly protected would be a desirable goal."
https://www.macrumors.com/2021/08/09/apple-child-safety-feat...
Do you really think they would go to all this trouble and then say oh you don't want to get scanned? Just turn off iCloud photos.