Europe's hot challenger banks risk losing their shine with mounting losses and customer 'flight to safety' during the pandemic

· *Three UK challenger banks posted their financial results for 2019 through July and August.
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· *Monzo, Starling Bank, and Revolut showed growth in revenues year-on-year but also mounting losses. *
· *The trio have won customer loyalty and positive press for sleek app designs and colorful payment cards.*
· *But their...