Since last July, a tiny, bare-bones EV that starts at just $4,500 has dominated the world’s largest electric car market, outselling bigger players and even Tesla almost every month. SAIC GM Wuling Automobile Co., Ltd.’s success was driven by a targeted marketing campaign conducted almost entirely online, pitching the Hongguang Mini not as a cheap car but a coveted accessory in brand-conscious China, to young women with fashionable colors, also enabling drivers to customize their vehicles in a way that’s not possible elsewhere.