Its in their blog
"In short: From now on, CyberGhost blocks the Torrent protocol on all free servers, to normalize traffic once again and to reserve our capacities for those who need a cost-free VPN for anonymous and uncensored surfing.
For subscribers using torrents on most premium servers is still perfectly possible. Only exceptions are servers in the United States, Russia, China and Singapore. For simplicity reasons and a rapid assessment of a single server, the server list in our application includes a yellow exclamation mark next to the name, if the respective server is inaccessible to P2P."