I guess you never consumed user-generated content then. Plenty of CC music is shared through file lockers. Plenty of freeware games are done through file lockers.

Here's a discussion on rpgmaker developers site about megaupload going down: http://www.rpgmakervx.net/index.php?s=e2dfd62fff9638c7224860...

And there's hundreds of sites like that, people creating content on different platforms that need a way to share it. How do you think they share their creations?