Apple, Microsoft and Nvidia are investing billions of dollars in Southeast Asia. Here’s why

The CEOs of Apple Inc., Microsoft Corp. and Nvidia Corp. are among the industry chieftains who've swung through the region in past months, committing billions of dollars in investment and holding forth with heads of state from Indonesia to Malaysia. Amazon.com Inc. just this week took over a giant conference hall in downtown Singapore to unfurl a $9 billion investment plan before a thousands-strong audience cheering and waving glow sticks. After decades of playing second fiddle to China and Japan, the region of about 675 million people is drawing more tech investment than ever. For data centers alone, the world's…