I also think it's an understatement to call Weixin as ubiquitous as Google in China. There are alternatives to basically every Google service. In China, many times there is no alternative to Weixin. 支付宝 (Alipay) is sometimes a substitute, but in many cases only Weixin is supported. Want to order food at a chain restaurant? Want to buy tickets for a museum? Want to choose the song at a Karaoke bar? Need to fill out a customs exit form? Weixin is often the only option.