They are using one of the oldest tricks in the book, rapid evolution as per Nature's handbook for how to constantly improve. By allowing the millions of monkeys^W AI agents total autonomy to "Throw Things at the Wall and See What Sticks"(TTWSWS, TM), this has lead to unprecedented and amazing progress towards AGI.

In doing so, they obviously need to keep track of the myriad of changes, hence the requirement to ensure Git can scale up.

(I'd like to think /s, but you know what, maybe not)