https://techcrunch.com/2018/06/04/n26-now-has-1-million-customers/

You don’t sign up to a bank account every day. And yet, German startup N26 has managed to attract 1 million clients across Europe. They generate €1 billion in transaction volume every month ($1.17 billion).

It took N26 only nine months to grow from 500,000 to 1 million. And the company now plans to have 5 million users by 2020.