Any free private tracker worth your time has DHT/PEX disabled thus making their torrents invisible for your typical govt / private entity searching for pirates. If those torrents aren’t public and can’t be searched indexed via DHT then the ISP or whatever knows you’re using the bittorrent protocol but they don’t know for what content. This particularly correct if you use sane settings in your torrent clients such as a blocklist + requiring encryption for all connections.
If you do those simple things and a use a private tracker you trust then your ISP/Govt can’t point fingers at you, they’ve no way of knowing what you’re downloading.