I wouldn’t bother with Usenet unless you have the need to keep a copy of your media. I say this as a torrent and Usenet user. Generally almost all of my needs are met with real debrid and Syncler. Occasionally if something is hard to find I’ll grab a torrent, but that’s it. Debrid is so much easier and near instant. I’ve still got Usenet block accounts that I’ve had for years because I have no need for them anymore.
Private trackers tend to have better quality control and selection. They also have stricter rules about ratio, seeding, and behavior. An invite is required. Sometimes you can go through an interview process to get an invite. Usually once you get started in a decent private tracker you can get into others through recruitment. I won’t name names, but it’s not hard to find info.
VPNs are only really necessary if you use public trackers. Private trackers are generally viewed as small enough and not worth the bother by copyright holders to pursue. Like someone else said earlier, it’s a matter of risk. I tend to view private trackers, especially those seen as “elite” and difficult to enter as being very safe.
Private trackers.