I've got an ex-colleague working at Revolut. 5 YoE, and he got hired for £140k. I'd be astounded if DeepMind were paying non-specialist, BSc developers £270k+. Monzo is behind, sure, but they still get a lot of attention, and don't pay badly. But my point is these companies are talked about way more than the "large century-old semi-government companies".