Nah, that won't work. China is a member of WTO and follows the TRIPS agreement. Therefore, I guess the RIAA will just go court in China, and they can still take down any repository which they'd like to. Lots of companies from the western country have won intellectual lawsuits in China.

Sites like sci-hub works in a way tricky manner. You can't expect an ordinary company which is in another country to do so, because they are still inside the framework of the international capitalism.