Did I miss the discussion that this could be part of nix itself? It seems like there is a need for such feature.
After browsing a bit around and reading the usage policy I am missing a sense of responsibility and quality for the content promoted on the site. Coincidentally I had recently a very lengthy discussion about a theoretically platform named flakehub and the majority of people agreed that it would require some sort of quality control to not be a loaded gun pointed at your foot.