What if the driver actually became a taxi driver so that he could embed himself into the company's hiring process, gave dozens of fair, yet informal candidate reviews, spent years gaining everyone's confidence, all specifically so that one day he could sabotage his arch nemesis' interview by lying and denying him a job!

This subthread is really getting absurd. It's a perfectly good test to hear whether a candidate mistreated someone who they might perceive to be beneath them, and only severely asocial nerds would interpret Op's anecdote as if they put this taxi driver into the CI/CD pipeline to pass/fail candidates.