Don't know, but I know they've been threatened to be shut down many times.
I go on there once a week to report all the videos from the sponsors I push. I've had 1000s of files removed, (mainly topbucks videos) bet the uploaders bang their heads on keyboards because of me. They spend hours uploading gigabytes of videos, in 30 seconds I pull up the print view of megathreads, gather all the links using Jdownloader and send an email to rapidshare or hotfile. BAM.
Technically RS and HF claim they won't remove videos unless you can prove you're the copyright owner, but they just do that to deter thousands of complaints. They ALWAYS remove files I report.