I think if they demonstrate that they dogfood it the way Amazon does it will go a long way. Based on talks I've seen I know some internal teams use it (or at least did when it was free for them).
We don't talk about our own usage a lot, because we mostly care about customers (like Quizlet!) talking about their usage in their own terms. However, I personally worked with Chrome's Clusterfuzz team when we launched Preemptible VMs (https://cloudplatform.googleblog.com/2015/05/Introducing-Pre...) and they're still there today.
Disclosure: I work on Compute Engine (and launched Preemptible VMs).
Disclosure: I work on Compute Engine (and launched Preemptible VMs).