TPS recently announced open registrations to the world through their blog (which is viewable by general public). Quoted below is a detailed explanation on how the open signups work – this was originally posted at https://www.thepiratesociety.info/blog/?p=1098 :

Announcing to the torrent world that for the first time since we reopened 10 weeks ago, we are opening registration for new members. Here’s a quick rundown on how it works.

You may have known that in the past, TPS took in new members via an IRC interview. This interview was not only time-consuming for prospective members, but also consumed huge amounts of staff time and resources, so we are simplifying the process. If you are interested in joining TPS, just click the “Register” button on the home page. Read the rules and see if TPS is the kind of place you’d like to join, then proceed with the simple application form. After you submit it, a staff member will go over it and with luck you will receive your invite via e-mail. Please be patient – we have been going through a lot of invitations in the queue.

Please note that if you were previously disabled, do not create a dupe account (we will spot you quickly), but go into our IRC help channel (see the home page) and plead your case. If you were disabled because of inactivity, chances are you will get your account back. If you were a “Castaway” because you broke the rules, most likely you won’t be let back in. (sorry)

We especially welcome users who are new to the torrent world and need a helping hand (or two) in getting to know how it all works. The regular members will be happy to assist you. Veteran members of private trackers would also like it here, mingling with fellow established members and tracker staff. (Plus you can help guide the n00bs.) Similarly, tracker staff members are of course welcome at TPS as well.