Earlier quoted context omitted.
(This is a stub reply so I can collapse the various comments responding to this, so as not to distract too much from the rest of the thread. Sorry, non-JS users.)
Have you considered something like [ROBOT 9000]( https://en.wikipedia.org/wiki/Randall_Munroe#Other_projects ) for HN? Not perfect, but it could be fun and a nice reminder to stay original.
We already check for strict duplicates but that's so strict a test that basically no post passes it. What would be needed is software to group the repetitive posts into equivalence classes but exempt the posts that are on the same topics but add some original twist. That seems hard for software! even with modern AI. I'd love to be proven wrong though. If anyone wants to take a crack at it, the data is all public.