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Why is npm/www no longer open source?
There used to be a repo for npm/www but it has been archived.
The best answer for this is to point at the blog post from when this happened:
tl;dr we did not (and tbh, probably still don’t have) the resources to give justice to maintaining the open source aspect of those repos. I don’t expect this decision to change any time soon (and it’s really not up to me, either, fwiw).