Why #facebook is not using git

long answer here https://graphite.dev/blog/why-facebook-doesnt-use-git#why-and-how-facebook-migrated-off-git

In short, they have too much code/commits in one repo, and after some point it was making git slower in 2012 😂 12 years ago they broke git with their size. Then they moved to #mercurial

I never used mercurial before now I wonder 🤓