Robinhood is the only one among the new batch of fintech startups that encourages active trading. Their entire UI is built to optimize for ease of trade rather than thinking in terms of portfolio objective and diversification.

Contrast that to Wealthfront, Betterment, or Acorn - they're all built on the "buy and hold" philosophy. They use technology to automate allocation, tax reduction and rebalancing, while investing solely in index funds. How these two trends play out is fascinating to watch.