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They could just send fingerprints, sure.

The problem is that you presumably want the image to be blocked immediately upon upload.

But facebook is worried that people will abuse the system, and they don't want images to be instantly wrongfully blocked until someone can review it.

Abuse-resistance. Instant blocking. Perfect privacy. Pick two. There's no perfect solution.

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Why not suspend reported images for review. If the review indicates the reporter is abusing the system, blacklist the reporter from the automatic function. Also block new and recent accounts, and stop automatic blocking for images on frequently targeted accounts and major accounts (e.g. If someone is reporting Donald Trump, manually check, don't automatically remove).

Doesn't this system already exist? But reporting an image means it wasn't preemptively blocked, the benefit of the new system.

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