Do sites like RapidShare and MegaVideo Moniter downloads and streams?

Basically im asking if they moniter and bust the downloaders who are downloading copyrighted stuff. Im doubting it though since they dont even seem to be going after the providers. Would a proxy/ IP changer hide your tracks? Please note i do not download illegally, im just curious.

the best monitoring tools is when the copyright holder complains about it to them.. then the downloader will be busted. Because this sites have policies that the user should read before signing up.

Rapidshare Proxy – Remote Downloader