German challenger bank N26 was an investor darling, backed by Peter Thiel, Tencent, and Li Ka-Shing. The company, founded in 2014, was one of the original banking disruptors but ran into a major hurdle when German regulator BaFin put a cap on how many new customers it could take due to concerns around money laundering controls. The cap expired last year - N26 has seen a jump in new customers and is forecasting a 40% revenue rise for this year. Bloomberg's Caroline Hepker and Tom Mackenzie spoke to Founder and CEO Valentin Stalf about the bank's bounce on revenue and customer growth, plans to come to public markets, and thoughts on regulation.