Because your narrative is wrong, it wasn't a Google project, it was a group of Google employees that rebeled and were lucky to have their line manager support,

Because your narrative is wrong, it wasn't a Google project, it was a group of Google employees that rebeled and were lucky to have their line manager support, given being UNIX idols. Google upper management was, and is, perfectly fine with Java, Kotlin, C++ and Rust, for the most purposes. I won't suggest any "technical" answer, because clearly you only want Go.