JOHANNESBURG (Reuters) - Armed with low-cost operating models, three South African digital banks are betting on aggressive pricing and data analytics to attract tech-savvy, price-conscious consumers when they launch next year in a rare challenge to the old guard. A woman stands next to a TymeBank client onboarding kiosk in Johannesburg, South Africa, November 28, 2018. REUTERS/Tiisetso Motsoeneng It will be first time the $30 billion industry has faced competition since the early 2000s, when...