One can’t help but baulk at the sheer scale of the challenge Monzo will face when it opens its Dublin outpost. While the Irish banking sector desperately needs further competition after the exit of Ulster Bank and KBC in 2021, there is already something of a fintech incumbent that has inhaled a lot of the ground ceded by the traditional banks. Fellow London neobank Revolut has installed itself as a firm favourite in the five years since it opened its Irish office. Revolut has around 2.7 million customers in Ireland and has become so ubiquitous that its brand name is…