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The problem imo is deception. I honestly think bots wouldn’t be out of place on facebook if they were all clearly marked as such, and you could filter all generated content with a single toggle.

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M cannot replicate the particle after they read it, so A and B will detect M’s attempt when they compare results.

The same as classical one-way encryption, it only works through authenticated channel tho. It’s not magic, you have to have some kind of pre-existing secret or rely on third-party authentication