When Natasha Craft first got a Yotta banking account in 2021, she loved using it so much she told her friends to sign up.The app made saving money fun and easy, and Craft, a now 25-year-old FedEx driver from Mishawaka, Indiana, was busy getting her financial life in order and planning a wedding. Craft had her wages deposited directly into a Yotta account and used the startup's debit card to pay for all her expenses.The app — which gamifies personal finance with weekly sweepstakes and other flash...