Open source Mononoke and EdenFS don’t really work outside of Meta. I looked into it some years ago for a large monorepo, determined it wouldn’t work, and shelved it. If I had a team of people and/or agents available we likely would have built it ground up instead of adopting Sapling’s codebase.

Seems a bit silly to raise all of this fuss over an MIT licensed project that is both open source and not actually usable. What do you expect people to do with the source code, admire it?