I didn't know about this topic, but I can confirm this story. These are my findings.

Code: 
Fileserve
Room 607, 6/F, Yen Shing Centre, 64 Hoi Yuen Road, Kwun Tong
Uploadstation
Millenium City 5, 418 Kwun Tong Road, Kwun Tong, Kowloon, Hong Kong
Filejungle
Unit 3-4, 9/F.,Block B, Chung Mei Ctr, 15 Hing Yip St., Kwun Tong
I got these addresses from their DMCA pages. When you locate them using Google Maps (Locations)
You will see all 3 mail addresses are located in Hong Kong, China, and they're not even 1 km seperated from each other.

I already suspected they were one and the same company because of the similarities in their website code. Furthermore I was downloading from Fileserve once and did a whois check for the IP-address.
The server IP is: 108.61.6.52
Just visit this IP-address in your browser and you will see a Jetty webserver response containing Fileserve links, so it's used by Fileserve.
But if you do a Whois check you will see it belongs to Uploadstation LTD
So Fileserve, Uploadstation, Filejungle are one and the same company.
I don't have proof for Filejungle but because of the similarities in their code I'm quite sure its the same company too.

The same story holds for Filesonic and Wupload, which are also one and the same company. (Also Chinese)

Don't ask me why they do it.