A humidifier in the shape of a smoke-spewing dragon for 1.61 euros? Donald Trump socks with glued-on ankle toupee for 2.48 euros? A cleaning brush specifically designed for Apple AirPods for 88 cents? On Temu, the app from the Chinese e-commerce provider Pinduoduo offers just about everything you’ll never need – but at prices that make you wonder if you should grab it after all.