Google is a resume tick box. Go over to AngelList and look at lists of startups. Take a drink every time you see 'worked at Google' listed as a qualification. You'll be destroyed in an hour or so.
Thus people get jobs at Google, put in a year or two, and go off for a higher paying and/or sexier job or a startup of their own.
Go is laser focused on simplicity, maintainable code bases, and uniformity to allow the next crop of Valley recruits to pick up where the last crop left off.
Like every programming language ever, there are surely many Golang users who've used it solely to add a keyword to their resume. That's not a very interesting observation, because the same thing is true of Rust, Scala, and even Haskell.
Further, that doesn't really address the question of why so many teams select Golang in the first place. A programmer might use Golang to get the keyword on their resume, but a team shipping a new product has no such incentive.
It's quite similar to the notion of "I'm a PHP developer and I don't understand why everyone says it is terribly designed! I learned to work with it and never tried anything else, so it can't be that bad!!!".
Not every developer cares about software development. There are plenty of people who chose this profession after they heard that a random developer can become the next Bill Gates by writing the right iOS app.
Having a language which doesn't require an inexperienced and non-interested developer to reflect on all the lessons learned in the last 40 years of software development and computer science fits the bill of this kind of person pretty well.
Sure, he/she is missing out on 4 decades of improvements to this profession, but who cares? Despite all the medical advances, there is still an economic niche for quacks selling "cosmic crystals" to cure your cancer.
There is nothing wrong with this. People don't pick a job in finance, because "they like to work with numbers" either.
We should just be aware of it.
So, "not knowing any better" is kind of ridiculous.
(For many jobs one year of experience is perfectly fine!)
I think people who can think critically and evaluate various options rarely join personality cults, which kind of explains Go's current community.
I largely dislike Go but keep picking it because it is the lowest common denominator of languages my team will use and I really like them.
Even the proponents of Go on my team are moving away from it as their preferred choice, but for now it remains the only consensus fallback.
The next language I want to learn is OCaml, but thats because I'm sort of obsessed with unikernels.
GO fits the bill.