He worked on: Go, the Sawzall language for processing logs, and distributed systems. Go and Sawzall are usable and used outside Google.

Are those distributed systems valuable primarily to Google, or are they related to Kubernetes et cetera ?

He was paid by Google with money made through Google’s shady practices.

It’s like saying that it’s cool because you worked on some non-evil parts of a terrible company.

I don’t think it’s right to work for an unethical company and then complain about others being unethical. I mean, of course you can, but words are hollow.