I switched companies. I started go when replacing php at a previous company. I wanted to do rust at the time, but my options from the CTO were go or newer php (we were 5.x IIRC). I chose go.
My current company decided on go before I started. There's some python ml stuff and some other things in functional languages, but we're primarily go. I don't know why specifically it was chosen. The old codebase was a bit of go and the original legacy in Ruby. I'm definitely glad they decided to move away from Ruby slowly (and compleltely in the new codebase).