The first question would be if you have any experience in torrenting in general and private trackers in particular?
Some trackers are notorious hard to join or even completely closed, however others have open signups or application signups. You are also missing some German private trackers in your list.
Some German private trackers like the already mentioned World-of-Tomorrow or SpeedTorrent Reloaded or The Shinning allow application signup, if you are already experienced in trackers. For other trackers like Immortuous one can signup on their forums and apply for an invitation. Just visit their sites and look for an application/signup link.
Your question is too generic to provide more helpful answers.
Only for NFLX for the last decade or so, I would had cancelled that subscription years ago, but the guys I share my account with insist in keeping that Netflix account.
I have absolutely no idea why. I haven't watched Netflix in years myself. Well I pay 10 bucks a month for Netflix and the other guys are paying me 12 bucks a month, so this useless subscription costs me -2 bucks every month.
For me pirating is more convenient than watching the very same stuff on Netflix, especially since Netflix stopped working on some of my devices...