ByteDance Ltd. has overtaken Baidu Inc. in the race to deliver China’s answer to ChatGPT — at least in terms of popularity.Doubao, the artificial intelligence-powered chatbot released in August, surpassed Baidu’s Ernie Bot in downloads last year and now has more regular monthly users on iOS in China, according to Sensor Tower data. Ernie got off to the fastest start in the country, but ByteDance has now taken the lead and other rivals are approaching....