Think it in this way: in this age, good IT companies make profit/benefit from promoting free-flow of information (e.g. Google, Twitter, Facebook and Wikipedia).

Think it in this way: in this age, good IT companies make profit/benefit from promoting free-flow of information (e.g. Google, Twitter, Facebook and Wikipedia). The Chinese gov is trying to ban the unconstrained flow of information (the whole idea of free-flow of information is considered harmful to the current regime). Thus, the website is banned by Chinese gov must be particularly good at promoting the flow of information, which makes them good candidates of successful IT companies.