On my enterprise space, .NET has indeed not much traction outside Windows. even with .NET Core as many key products are yet to be UNIX friendly.
However when we go for UNIX solutions, Java is the alternative, Go is not even part of the picture unless we are talking about devops tooling (which nowadays is becoming trendy to rewrite in Rust anyway).
I feel like I'm shilling for C# in this thread (a handful of replies so far) so apologies, but I'm genuinely not being partisan here as I'm a dev using both Go and C# daily.
However if you think .NET doesn't have traction I can only assume you are excluding virtually the entire enterprise in favour of start-ups and pure-tech firms. For the second group you may be right. For the first group Go is (relatively speaking) absolutely nowhere in comparison to .NET, which has for years had the enterprise virtually sewn up alongside Java.
Outside of enterprise I agree you're probably right, which is a shame as it is approximately the equal of Go in most areas, worse in some and better in others.