Their database is huge. No doubt. But 97% of users download the popular TV shows. Game Of Thrones, The Walking Dead etc... so they can find those elsewhere and enjoy their accounts forever.
No need to try that hard to join
BTN and risk a ban sooner or later. Just because their inviter's inviter, also invited a "bad user" 2 years ago!!! And the
BTN staffers just found out this "serial killer" who might be a risk for their "amazing community", so they decided to ban 50 other accounts (probably some great users among them) who are connected somehow (they ban whole invite trees easily, no matter what happened).