Interesting fact: the first commit is 2 years old and is entitled "Boilerplate for new Google open source project".
Either they rewrite git history or it took about 2 years to get approval on making this repo public.
Either they rewrite git history or it took about 2 years to get approval on making this repo public.
So probably they just started the project two years ago, had aspiration to open source, and finally just did now. Some teams might publish earlier, some like to wait until it's had enough internal usage to prove it out.