We allow P2P traffic on certain servers. Their list is in each of our NordVPN applications, in their server list categories, under the category "P2P".
Alternatively, you can also find their list at the bottom of our server page, in the P2P category: https://nordvpn.com/servers/
Connecting to other servers with a running file-sharing client will reroute you to our P2P servers in Canada or the Netherlands. You can read more about it more in our blog post.