While it's important to note that Tencent, which publishes QQ Tech, is one of Qihoo's competitors, the latter company has developed a reputation for using questionable business practices. Last week, China's State Administration for Industry and Commerce (SAIC) issued a warning to Qihoo for unfair competition, citing anti-virus software used in its Internet browsers. Tech In Asia has the rundown of the the ways SAIC says Qihoo engaged in unfair competition. Furthermore, this is the second time Qihoo has had its mobile apps taken down by Apple. The first time was almost exactly one year ago. Qihoo claimed then that the removals were a mix-up caused by its apps receiving unusually high numbers of positive/negative feedback by unknown sources, which triggered an automatic removal by the App Store. While its apps quickly reappeared in the store last year, this time it's more serious.