You won't see Elon Musk in Davos this year. He says it’s boring on Twitter, which he now owns, and which is still bleeding money. The same big losses are being seen at his electric car maker Tesla. But it would take a lot more for the billionaire to go broke. The truth is that in today's world, tech titans seem unbreakable, even when the likes of Musk face a lawsuit for allegedly manipulating Tesla's share price.