I can confidently say, having rubbed shoulders with the botting / gold farming / hacker community in China that it is HUGE. Like YYYUGE! back when the whole ride hailing industry was still in a subsidy war, you had drivers who were spoofing their rides to get kickbacks from didi/Uber. Pinduoduo suffered a pretty big loss a while back from not accounts scalping subsidies. I have friends in my wechat who used to share their huge walls of remotely controlled phones. So yes it is a huge problem in China. There is even a phrase for it, 撸羊毛