This is what their homepage says:

Lossless World Invites

After alot of consideration, it has been decided there will be no open sign up period here at losslessworld.

Instead we will occasionally give invites to members, with the first lot being given 07/20/

Here's your chance to show your friend, family member, etc just how great LW is, and also share with them all this place has to offer. Great music, great members, and a great atmosphere.

Please, only invite people you trust to LW. We need members who are interested in sharing, are polite, and courteous to other members, respect tracker staff, and are here for the love of good quality lossless music.

Please use your invites responsibly, and thanks everyone for making this a great place.

You wouldnt see LLW invites for some time now.

Good luck inviting.