Well they have damn good lawyers, since now they don't have to check filenames, check checksums, IP addresses, manually check lists of links (according to your post below) and whatever else.
So what does that leave Rapidshare with? Do they just have to manually check files when a copyright owner submits a complaint with a list of links?
(On a sidenote, I could make a pretty good link finder and make it send complaints automatically, there must be some good money in offering such a service to copyright owners)