Yes, ARC is a great example of how a PG project should be open sourced and run by the community.

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API is read-only; API should be "full service" and the first interface to HN, not a supplement.

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Yeah, whole ARC (aka PG) thing is an issue too; FYI, those install direction are dated, here's the info: http://arclanguage.org/user?id=akkartik

PG doesn't even appear to be actively involved in ARC anymore: http://arclanguage.org/user?id=pg

Find it hard to believe if YC funded a startup like HN that they wouldn't require an explanation of why ARC made sense as the language of choice.