I find it disturbing attributing particularly sexuality to children (actually I find a lot of adult looking clothes more disturbing than a nude child).
I know that there is people with sexual disorders (I would strongly argue that pedophilic arousal is one), that commit serious crimes. I also do not advocate publishing any nonconsensual pictures on the internet.
However disallowing something just because it can be abused is rediculous. Banning this guy protects nobody from nothing. Yes they could have blocked the upload of the image to the cloud (I would be happy to locally install any nude detection AI that does not communicate with the cloud. Even something that ask me if I have consent feom all identifiable persons in an image is fine for me. I think the father would actually have been happy about this. No need for manual inspection.)
You can't really fight nature. If a child is born to horrible parents who abuse them, there is only so much anyone can do... The child's life will be ruined from the beginning, the government cannot undo the damage which has been done.