I can chime in. Googler here, who knows the OR team very well. They are solving EXTREMELY large problems for customers. I can't tell you who, and I can't tell what problems, but they are among the biggest OR problems you can imagine.

(No, I don't mean within Google, although they solve scheduling problems there as well.)

EDIT: There are articles:

https://cloud.google.com/press-releases/2020/0120/lufthansa

https://www.cnbc.com/2020/01/19/lufthansa-taps-googles-cloud...