By Paul Carsten BEIJING (Reuters) – Apple Inc has a lot for which to thank people like Deng. A Beijing-based quality analyst, she gave only her surname as shes embarrassed by how much money she spends playing mobile games on WeChat, a hugely popular messaging app developed by Chinese internet giant Tencent Holdings Ltd. The most expensive time was when I spent 68 yuan ($11.08) on a leopard on Tiantiankupao, said Deng, an avid iPhone user, referring to Tencents hit game – called Timi Run Everyday in English – where characters run through obstacle courses. Deng and tens of millions like her have made China Apples third-largest market for software sales, and a huge chunk of that comes through WeChat. Known locally as Weixin, WeChat had 438 million monthly active users globally, mostly in China, at the end of June, and has rapidly evolved from a messaging tool into a digital Swiss Army knife, allowing users to send messages, play games, book taxis and shop online.