Unlike Java or C# or some other languages, there's basically no monetization path for Google from Go. They don't sell a Go compiler or IDE or anything like that. The whole this is open source and free. Go for them is a project aimed at solving their own problems, and if it solves yours too, so be it. With that in mind, your theory doesn't make a whole lot of sense.
As one of the people who does upvote the Go stories and has posted one myself, I think the real reason you see this is Go is an incredibly fun language to learn (at least if you're already a programmer, I can't speak for true neophytes) and the design of both the language and the API remind you about how much complexity you can get out of combining a few simple concepts. After years of dealing with other people's 1000 line FactoryOfFactoriesFactory classes in Java, such simplicity is incredibly refreshing and it is difficult not to try to direct other programmers into taking a look.
IMO there's a lot of benefit to playing around with Go even if you end up not using it as a primary language and thus I plan to continue evangelizing it.
As one of the people who does upvote the Go stories and has posted one myself, I think the real reason you see this is Go is an incredibly fun language to learn (at least if you're already a programmer, I can't speak for true neophytes) and the design of both the language and the API remind you about how much complexity you can get out of combining a few simple concepts. After years of dealing with other people's 1000 line FactoryOfFactoriesFactory classes in Java, such simplicity is incredibly refreshing and it is difficult not to try to direct other programmers into taking a look.
IMO there's a lot of benefit to playing around with Go even if you end up not using it as a primary language and thus I plan to continue evangelizing it.