Keep in mind, I use rust and c++, primarily. I just look over the fence at go and can appreciate what it does well.
They realized C++ sucks for simple services and due to the Oracle litigation they were trying to get away from Java where possible.
Having written backends in C++, Java, Python, Rust, and Golang myself, Golang is far and away the best tool for the job in my opinion.
not a lawyer here, but isn't the litigation related to Android Java-clone, not 'server-side' java-usage?
However, Koltin and Android depend heavily on the JVM eco-system, and Google is certainly not going to rewrite everything in Koltin/Native or start using ART outside Android.
Even if you castrate yourself to Java 7, whatever works depends pretty much on the Android version.
What does Google do on servers that has not already been served by Java and C++? As far as I know, the vast majority of code both existing and newly written at Google is Java and C++, not golang.