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Because it caught one of four :) because it's unclear what "works" means, I spelled it all out. :)

I guess if it catches some but not all, that's better than catching zero, but then what is the false positive rate?

Randomness would also catch 'some but not all', after all.

I would think that you would just send posts with a prediction rate > X to the mod queue as auto-flagged

Assuming that the false positive rate is low enough. That's the question, no?