By ZEN SOO HONG KONG (AP) — China’s market regulator on Saturday blocked the merger of Tencent-backed game streaming platforms Douyu and Huya following an anti-monopoly investigation, as authorities ramp up scrutiny of some of the country’s biggest technology companies. Huya and Douyu — which provide videogame live-streaming services akin to Twitch in the U.S. — are two of the largest companies of