TL;DR: if it goes boom.. the world will just move on as usual and we just get back up.. just like the US market.. except China wasn't as hyped up and the media is still control by the government so it won't be as bad as the US.
So we have several datacentres around the world, and when users input a link. A server will take the task and try to download the content on the web, based on trial & error and user's response it learns how to download from a particular website.
It also currently works for novamov, movshare, filebox, dropbox, google drive, putlocker, videobb, rapidshare, tudou, videoweed, gorrilavid, mediafire, hotfile, and over 300+ sites..