As a heavy private tracker user I have found that most private trackers life and die by super seeders from seedboxes, just seeding from a home connection doesn't contribute any meaningful bandwidth and only helps you get bonus points from your tracker.
You're going to have a hard time maintaining an acceptable ratio on a non-ratioless private tracker without a seedbox or a NAS/homelab that's on 24/7. These trackers largely self-select for power users.
I'm on several and have no issues, I just seed when my computer is on but with low bandwidth. I live by long seedtimes, bonus systems and Freeleech and have easily a few terrabytes of buffer on my trackers
For obscure stuff that isn't already on Netflix etc it's often regular people... One time I was downloading something to watch with a friend and turns out it was friend seeding it. And whenever I seed I often see upload traffic.
