I personally think that most, if not all, users think they are loading a Bidu browser when they go online. So when Bidu redirects them to its home page via a search, the users don't mind at all. They thought they were on Bidus' page the entire time.
Have you ever noticed how Qihu's browser and search logo is identical to Bidu's?
If China had decent copywrite laws, Qihu wouldn't have any market share at all, IMO!