In its early days, banks tried to block Bankin’. Some set up call centres, warning customers of the danger of using the personal finance app, and encouraging them not to use it. On one occasion, they even called Joan, not realising that he was the fintech's co-founder. Nowadays, with open banking, it's a different story; banks, for the most part, are cooperative. And Bankin' is now blossoming into one of Europe’s leading consumer finance apps - with a potential B2B spinoff to boot.