In late 2019, Mark Roden sat down with The Currency. The founder and chief executive of Ding, the worldwide mobile top-up service, was at the Web Summit in Lisbon and was explaining why he felt the company should have been much bigger than it was. “I take responsibility for that,” he told my colleague Francesca Comyn. At the time, the firm had offices in Barcelona, Bucharest, Dhaka, Dubai, New Jersey, Miami, Paris, and San Salvador and employed around 150 people at its Dublin headquarters in Ballsbridge. Yet, Roden felt it should have been bigger. So, what had held him back?…