Just Eat Takeaway has taken a near €5bn writedown on the multibillion euro mergers that created Europe’s biggest food delivery group, revealing the cost of buying rivals at the top of the sector’s lockdown-driven boom. The online food delivery company on Wednesday reported a €5.7bn loss in its full-year earnings for 2022, up from €1bn a year ago, largely due to a €4.6bn impairment charge on past equity-funded acquisitions.