I can't think of another language that splits its official web presence across separate domains like this. Rust (rust-lang.org), Python (python.org), Ruby (ruby-lang.org) all have sections dedicated to marketing/eduction (usually "Community" or "Success Stories" tabs), as well as hosting the language reference, documentation, and downloads.
The result sure is confusing. Why aren't the blog and playground hosted on go.dev, for example? I can only imagine this is the result of internal politics at Google; it sure smells like the Go team engineers didn't want the growing Go marketing division to corrupt golang.org.