If we're talking only about start-ups that have gotten big during this boom, then you're very wrong.
Uber, Xiaomi, Airbnb, Palantir, Snapchat, Didi Kuaidi, Flipkart, WhatsApp, Pinterest, and Dropbox are among the biggest winners so far. There's nothing Wall St or financial engineering about any of those. They're all legitimate businesses and or services that consumers blatantly want.