It's indeed specific to our workflow -- allowing additions without moderation would cause all sort of problems we don't address; but not to OCaml, e.g. Homebrew uses a very similar, GitHub based workflow (which we actually drew lots of inspiration from) !

What is nice is that the moderation, if given the proper reports, e.g. Travis with lint and security checks, is very fast in the simple cases, and readily opens discussion in the others -- that's where GitHub really shines.

I mentionned GitHub, but note that we intend to also provide the tooling to host your own signed repository, indenpendently of it.