I remember what Sun did with Java back in the day. No, I do not agree that Go has been massively marketed.
I will admit, however, that Go was created and supported by Google, and that mattered. It mattered, not in the publicity, but in the tools and libraries (and maybe even in the tutorials).
Compared to C++, Haskell, Python and the long list of other languages not directly backed by BigCos.
So your point is because Java has been marketed more then Go that Go is not massively marketed? If you take the set of all languages and would make a sorted list of how many hours and dollars where spend to market it then I would be very, very surprised to not see Go in the top 5.
C++ has vendors behind it. Those vendors make actual dollars selling C++ (or at least tools that work on C++.) When Microsoft markets Dev Studio (with C++ support), is that marketing C++? How about C#?
In contrast, what does Google do to market Go? Put up a website, and put out notices of the next version? When have you ever seen an advertisement for Go? For a tool that supports Go? How about for C++, C#, and Java?
I'm being very clear. A language with a big company behind it the likes of Google, Facebook, Microsoft etc. I have defined it two times now. That there are some vendors which make money with a language is very different.
Advertisement is a subset of marketing. Back in the day when Go was "new" You saw daily posts on many programmer focused communities about it. Google bankrolled the entire development of Go. Blogposts of many googlers talking about the language. Google sponsored Go events. The positive image of Google itself at the time of Go initial introduction.
You try to weasel me towards C# and Java when those are not two language I even have mentioned. But since you want to hear about. Yes both of these were also heavily marketed.
But if the big company behind it doesn't do anything, what difference does it make?
Or, if the big company doesn't do anything more than is done for other languages (Rust, say), what difference does it make? Is Rust marketed in the same way Go is? Per your definitions, I would say yes, even though the Mozilla Foundation isn't a big company.
But then, is Haskell marketed in the same way? I see lots of posts on it, at least here. Lots of blogposts on it. But there's no big company, or even foundation, behind it. Is that marketing?
Why do you define a set of actions as marketing when people who work for Google do it, but not when others do it?
I remember what Sun did with Java back in the day. No, I do not agree that Go has been massively marketed.
I will admit, however, that Go was created and supported by Google, and that mattered. It mattered, not in the publicity, but in the tools and libraries (and maybe even in the tutorials).