Did the monetization policy change actually help creators?
Measure impactHardProblem. YouTube changed a monetization policy (say, expanding which videos can earn ad revenue) and rolled it out region-by-region, not by user. Afterwards, creator uploads and earnings rose in the launched regions. Did the policy cause it, and was it worth it? You can't A/B this by user.
Before you reveal: say your answer out loud, as if you were in the real interview — get your reasoning across clearly first. There is no single correct answer: reading what the interviewer is really after and defending your own thinking is what makes an answer strong.