School is where I first saw these. Every classroom had bootleg disks. They’d buy one copy of a program and then copy one for each classroom. Later when moving to PC’s from the Apple II, they’d clone each hard drive in that school from a master drive.
Private. Speeds are much better and your stuff lasts longer. I tried several times to have public options for my Coliseum Video uploads and all have failed in some way. At least with private trackers, I know that they’ll stay seeded for a long long time.