> I consistently heard that Monzo's competitors like Revolut are going to be a future case study in scaling before great product/market fit. I don't know how many people have Revolut accounts, but nobody seems to be using their cards in public.

Monzo is a licensed bank in the UK, and Revolut is not.

Still, Revolut has about 30% more customers in the UK than Monzo, and about 3x more in total, since it's available in the entire EU. And, unlike Monzo, which is still losing money, Revolut has been profitable since February 2018.

That's because Revolut does much more than Monzo. It provides multiple premium account types, virtual credit cards for online payments, business accounts with open API access, credit, insurance, and soon – fee-free stock trading like Robinhood.