Sorry to correct you, Qihoo doesn't have any advertisements in it's interface. I suppose Qihoo is getting enough funds from the governement.
The product has been tested and re-tested by various independant labs and even users here, there's no backdoor/bloatware in it.
Qihoo 360 is China's largest Internet security service provider, and has the world's largest user base.
Qihoo 360 challenged conventional wisdom by offering free antivirus software with innovative cloud technology, thus rapidly earning the trust of 500 million users and extending its market scope to US$10 billion.
Our Vision & Values is To become the most respected Internet security services company in the world, To put customers FIRST and To strive for constant innovation.
Revenue comes from sharing user traffic with partners atop the 360 open platform.
User base built from distribution of 360 free software and services.
Now, Qihoo 360 is promoting 360 open platform to overseas market and will make profit from the platform and model of Search, Navigation, Game and Advertisement.
We offer comprehensive Internet and mobile security products and services for free to about 500 million PC Internet users and over 640 million mobile users in China.
With friendly and interactive user experience and leading cloud-based Internet security technologies, our products are trusted by a massive and loyal users who enjoy Qihoo 360's around-the-clock protection for their daily online activities.
We continue to broaden and deepen our product and service offerings while adhering to a use-centric philosophy. In addition, we will leverage our massive user base to build a truly open Internet platform, offering a wide range of products and services from third parties, such as web games, online video, E-commerce, travel, SNS, and other applications.
Click to read our financial reports.(
http://ir.360.cn/phoenix.zhtml?c=243376&p=irol-reportsOther )