Google is the fifth contributor to the Linux kernel, both in terms of change sets and lines changed, doing about 6-7% of the work. It's very hard not to use anything Google touches, though I suppose you could use macOS, Windows, and one of the *BSDs unless they contribute to that as well.
I would love for a ChromeOS Flex competitor to show up, but it's the only Linux distro I would put on someone else's PC if I'm not available for tech support 24/7.