Earlier quoted context omitted.
Do you really imagine some significant number of Google's search, cloud, etc customers were driven to Google over a competitor because of "good vibes" derived from Go? Google only develops Go because it's a useful internal tool, and I'm pretty sure the marketing team nor the executives spend any meeting minutes discussing Go.
Marketing works in mysterious ways. Yes, I do imagine that people who are really into Go are more likely than average to join or start Go shops, and then pick GCP over competitors because they have to start with something, and being Go people, Google stuff comes first to mind. Lots of companies across lots of industries spend a lot of money to achieve more-less this fuzzy, delayed-action effect.
How many such people do you imagine there are? I'm active in the Go community, and I've been a cloud developer for the better part of a decade. It's never occurred to me to pick GCP over AWS because Google develops Go, nor have I ever heard anyone else espouse this temptation. I certainly can't imagine there are so many people out there for whom this is true that it recoups the cost that Google incurs developing Go.
Rather, I'm nearly certain that Google's value proposition RE Go is that developing and operating Go applications is marginally lower cost than for other languages, but that at Google's scale that "marginally lower cost" still dwarfs the cost of Google's sponsorship of the Go language.