Curated by whom?

If you want to curate a language package manager, there's nobody stopping you. Curation is a product that can trivially be built on top of an allow-by-default platform. If you want to make "NPM, except we've vetted all the packages", you can just do that, today, and you can even make use of all the OSS packages that already exist on NPM. Your hypothesis is that people want this, would value it if it existed, and would maybe even pay for it. So what's stopping people? Anyone who hasn't thought deeply enough to answer this question doesn't have the privelige to say "just curate it, what's the problem?". Curation isn't that simple, as any distro package manager volunteer would tell you.