I suspect most of us would like that, but it doesn't seem feasible. Detection of AI text is incredibly difficult, and false positives would be a huge stain on the user base. Can you imagine posting a thoughtful comment, then having your user banned for a false positive calling you out as an AI? I would find that quite offensive and I don't know if anything could be done to reverse the negative effect it would have on me in regards to how I view HN.