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I don't think there's a big issue with an unreliable tutor; a Harvard professor can spit out incorrect information, too. It's up to the learner to cross-check and verify the information. If you're uncritically ingesting facts from some other intelligence (artificial or otherwise), you won't be learning much anyway. The best lessons come when you make connections between different bits of information, so if an unreliable tutor forces you to make more of those connections in the process of checking its work, so be it.