We don't know - and because the rules of this game apparently bless lying about key compromise, and allow prohibitions on the disclosure of key compromise, you

We don't know - and because the rules of this game apparently bless lying about key compromise, and allow prohibitions on the disclosure of key compromise, you can't rely on the absence of bad news to assume everything's OK. You have the greatest allowable protection when keeping your keys on hardware where you keep physical custody - e.g., on your person, or stored in physical locations where you have exclusive access (e.g., not colocated/VPS, etc). Ultimately, you've got to decide if it bothers you to have the government - and the corporations and individuals that act on behalf of the government - archiving/indexing/searching copies of your data. I don't believe that it's appropriate for the government to invade our privacy without due process - but this view is not universally held. There's a core problem that's tough to solve - if people have access to strong, unbreakable crypto, then it's possible that there will be circumstances where a legitimate warrant will not produce usable information. On the other hand, if nobody has strong, unbreakable crypto, then it's possible that there will be circumstances where privacy is invaded without a legitimate warrant.