Robinhood Markets Inc., best known for offering commission-free trading, is rolling out a credit card to US consumers as it looks to become a broader financial-services company. The Robinhood Gold Card offers 3% cash back on all purchases, but you need to be a part of the firm's subscription-based gold program to get one. Chief Executive Officer Vlad Tenev speaks about the card and expanding its retirement products business. He's on "Bloomberg Technology."