Singapore-based startup YouTrip thinks consumers of Southeast Asia deserve a taste of the challenger bank revolution happening in the U.S. and Europe, and it has raised $25 million in new funding to bring its app-and-debit-card service to more parts in the region. Challenger banks have sprung up in Europe in recent years. Unicorns Monzo, Revolut and N26 are among those that offer their customers a debit card linked to an app and various levels of banking services, including savings and overdrafts. Brex — another billion-dollar-valued startup — is bringing that approach across the pond to the U.S. market.