In the company I worked for hackers uploaded porn to our disks so I was told. Not sure why maybe they wanted the free disk-space. Or maybe they were planning to blackmail us. Or maybe it was the IT admin who got caught and then claimed it was the hackers.

Some pirate release groups will compromise servers with public IPs to use as FTP hosts. The people that actually post the torrents then download from the FTP host, create a torrent, and upload it to the tracker (from their own PC).

Those hosts usually have fat internet pipes, allowing a bunch of people to download a copy over FTP at once, letting you claim credit for the first rip. There's also probably less of a paper trail; most of the hosts I'm aware of require some kind of ID, and would almost certainly hand that data over to law enforcement.

In my best knowing such topsites are in most cases using colo with excellent peering. In comparing, most company file shares are local in office for best transfer speed. A other possible similarity situation is useing for XDCC bots: such bots have similar idea of usage compromised machine but are mostly lower grade computer than a topsite.

That explains it probably. I now remember the IT-admin mentioning FTP. Thanks for the insight