Well im guessing they would not want warez related content. All I can suggest is try it or even read their T&C
Do you mean WordPress.com or WordPress on your server? the .com one will not allow warez while the self install one...well you can do whatever you want.
So why are you asking if you already have the answer in your head that you want ? You can do what ever you want with you self hosted site. You already know that warez sites are illegal, people hate them, and no one wants to be affiliated with them or link to them, so go ahead and do what ever you wish. The very nature of the site is illegal so why do you care about the small stuff? That's like asking "Do I have to use a legally registered handgun to rob a bank?"
you can use, but why don;t you try to spend your valuble time in any good niche blog than warez blog ? and u knwo warez blogs are hard to sell and hard to make ad revenue like ..