A VPN and there is nothing they could do in for 15 years in France to stop people using BitTorrent out of forbidding VPN usage (which they seriously begin to think about in some recent bills…)

Concerning BitTorrent I think DHT makes the use of trackers much less needed for clients to find their peers so it’s maybe not so easily stoppable. And as you say there are other protocols difficult to stop for P2P file sharing.