Unfortunately, they can't distribute their improvements, due to not having the time or YCombinator not wanting to give up some of their "special sauce" for dealing with spammers and vote rigging, etc.

And for what it's worth (which is likely very little) as a contributor to Anarki, support for > is on my list of things to add to sometime in the (mumble) future. Not that it will do HN much good.