Are you saying that there aren't garbage collected languages suitable for network development ("moving bits from place to place") with a substantial community except Go?
I mean, Java and all the JVM based languages comes to mind. Python, Ruby, Node.js (assuming performance isn't at the top of your list, which for many it isn't).
Go has a small community compared to all of the other popular languages.
Python is good for algorithmic stuff and things that need specific libraries (tensorflow, NumPy etc)
But if you want a garbage collected language for moving bits from place to place over the network, it's kinda hard to beat Go.