[longlivegnu]

Maybe a lack of resources out there or Google thinks if you learn a more generic language you will mold easier

[ctvo]

Maybe they're a large company and Go is a system's language used by a subset of the company. And maybe it's not important to learn for general technical development with no specific problem to solve.

[sukilot]

Go is only recently popular, so very few past successful candidates had Go experience, so recruiters wouldn't notice it.