This is also the answer we got at the time, "Why don't you do it this way, so that people don't have to send your team their nudes?" "Why don't you do it for us?"...I think that's not a very satisfying answer 
In order to generate the hash you need the original photo. Facebook can immediately tell if they have a matching image already, and can moderate it then and there if so. If not, that's good evidence you're the original creator, so block and moderate on first seen.
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by moderating there and then, you have delayed the removal process. what if the victim wants to ensure the photo is immediately removed on the first occurrence?
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There is no additional delay, the existing human-review system also requires moderation before removal. The point is the hash solution is objectively better than the "preemptively send us all your nudes" system, not that it's perfect.
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