Pirate bay is not Bittorrent. Bittorrent, Tor and Bitcoin are all services. But they are not centralized in hands of one person who needs to live in CH. They are distributed among thousands of small nodes which makes the entire service truly reliable. Also: each user stores the keys to his destiny vs. giving them to a single trusted party.
Silent Circle's services are designed to be 'untrusted.' Keys never leave the client. Feel free to build the client yourself, the code's on GitHub (the android clients are currently a bit easier to build than the iOS versions... ).
