Double-check your employment contract. The offer I received (and declined, primarily for other reasons but this was on the list) in 2017 clearly stated that it

Double-check your employment contract. The offer I received (and declined, primarily for other reasons but this was on the list) in 2017 clearly stated that it had to be unrelated to any of Google's work as a whole, and in fact to Google's actual or anticipated work - not just to the employee's assigned work.