One of the things that came out of the Snowden files, I believe, was that ISP's will monitor someone that has a BitTorrent client (uTorrent, qbittorrent etc.) installed on their PC, even if they don't use it. It is possible to hide BitTorrent *traffic* using a VPN, but, hypothetically, how does one hide the very existence of a BitTorrent client on their computer from potential snoopers?