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Is it possible to do this in discord? I think it would be much more successful than phpbb.

How so? (Not doubting, genuinely curious).

Discord seems to be a chat app, which is quite different than a forum and even HN itself

I think GP meant Discourse.

I think parent meant Discourse: https://www.discourse.org/

While the forum software needs to be decent, I don't think it is the fundamental reason it succeeds or not.