I didn't even know about that site

Media storage can pretty much turn into something illegal (but the owners can get out of trouble if they say they're not responsible for that or the content) at any time. I guess the only solution is for everyone to back up their stuff.
Honestly, some companies won't even care about who does what kind of fan stuff with their work as long as they're not selling it. Unless you're Fox or something and you have a large evil empire. Remember that SOPA scare?