Private trackers.
In the USA when you are caught torrenting copyrighted material it is because a firm hired by copyright owners sits in the public swarm logging IPs. They then send a warning to your ISP, who in turn sends you a warning.
Private trackers are by their nature a club that tries their damnedest to prevent people working for those kind of companies from joining the site to begin with.
It is still smart to use a VPN but your ISP isn't generally targeting your data in transit itself. It's usually a third party company hired out who cannot see your data streams directly. Thus a private tracker reduces the need for such measures since you are less likely to run into a hired hand logging your IP from a private tracker swarm.