It would be a great thing if they really decided to collaborate, but if they wanted to do just that they could do it by meeting on a "secret" forum or on irc, and share their releases by SFTP, no need for a tracker, and no need for people outside of their groups and sources to be on this tracker.
The only reason they did this was to attempt to make a new uber-1337 tracker, nothing more, nothing less, it's quite clear.
The 1337 tracker recipe:
*Create hype on a well known BT blog,
*Add a few famous P2P names,
*Deny spreading the word,
*Hide the site but make sure it's easy to find,
*Add a touch of signup hope,
*Make a 1337 fake signup page (your IP has been logged etc...),
*Add a touch of "signup closed forever",
You're done! You have your so called leet tracker that will make the joy of all traders and sellers, let it rest for a few days and enjoy

You can spice it up a little bit by adding a few threads on other well known BT forums, but be careful, the leet tracker recipe is hard to make and can always end up in a Big fail, which is another recipe much easier to do.