One of the things that makes ChatGPT different is its ability to scale such that it can provide that expertise to a much larger number of people and at a much lower cost.
That, and the fact that it regularly spouts "facts" that are complete nonesense.
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That, and the fact that it regularly spouts "facts" that are complete nonesense.
I will point out that human Hacker News commenters also commonly spout "facts" that are complete nonsense; in fact, it is us that trained it to do so.