What are you talking about. Please clarify if this is actually true:
I don’t plan to access it anywhere but home.
This would mean that you only want to access Jellyfin when you, and the device you are watching your show/movie on, are at home, where the Pi/server also is.
Is this correct?
If so, then questions about VPN, Certificates, DNS,.... do not matter.
- host Jellyfin on the Pi, e.g. with IP 192.168.10.20 on your local network
- open the Jellyfin app on your TV/Phone/PC, connect to http://192.168.10.20:8096/
- done
Now you can access it at home, and only at home. I honestly fail to see where a VPN would even come into the equation here (again, if you wish to ONLY watch when you are at home, as you've said).
On many trackers, you get "paid" for time seeded. Usually in the forms of bonus points or the like. You can then exchange these for improving your ratio (or a freeleech token, or an invite,...).
It's a system that also rewards keeping media available even if you are not uploading to anyone.
Also, keep in mind that often, a large part of the available content is freeleech (meaning leeching it doesn't affect your ratio), but seeding those torrents usually still does improve your ratio.