The leading OpenPGP client for Mac OS X has recently pushed a security update due to a bug that allows a local user to execute shell commands with root privileges.
As if it weren’t enough, by default, GPG Suite regularly contacts gpgtools.org to check for updates. So not only does gpgtools.org keep tabs on the IP addresses you use without explicitly getting permission, a carrier or state level entity could easily compile a list of GPG Suite users by monitoring requests to the gpgtools.org upgrade server (here and here). It doesn’t matter they are using SSL/TLS because the private information is your IP address.
Think about it, after a few months, your upstream carrier (or whomever has access to their logs) could compile a list of every IP users of GPG Suite use. My opinion of GPG Suite users notwithstanding, I am sure they have more interesting data stored on their computers than the average person.
NouveauPG is sandboxed, so it is entitled only to access files selected by the user using the system open and save dialog box. Absolutely no network access allowed. (The only autoupdate mechanism is through the App Store version, which is the same one used for OS X autoupdate. There is no way for a third-party other than Apple to know exactly what is being updated, and tracking IP’s to the Apple update servers will only give you a list of Macintosh users.)