From October 2018 to April 2019, what exactly changed with Monzo? If you were to objectively take the 2X-ing of valuation, you'd assume their revenues and profits (if any) doubled in that time frame.

Hard to believe doubling of real KPIs (like GAAP revenues) in 6 months, I hope YC isn't contributing to the unreasonable doubling of valuation without actual KPI changes.