That repo apparently used to be the largest on GitHub: https://news.ycombinator.com/item?id=5912922. I bet Google was repeatedly scraping the entire thing and putting too much strain on their servers at the time it was added. It's been 10 years, what are the odds nobody at GitHub today remembers why it was added?

Also, very relatable to see a decade old "I'll update this shortly" comment that was never updated. We all have a few of those.