This taxi driver in Hong Kong is running a more sophisticated demand aggregation system than most Series A startups. 10+ phones. Each one logged into a different ride-hailing app. Uber, DiDi, HKTaxi, Lalamove, maybe six more. He's not confused. He's running a multi-platform arbitrage operation from the driver's seat. The math makes it rational. Average taxi fare in HK is about HK$80. Dead time between rides kills daily revenue. If a second phone catches even 3 extra rides per shift, that's…