Obviously, anyone can get their hands on Apache, etc. Your addons may or may not have been GPL'd as a result of being addons to the AMP stuff. Depends on exactly how they were implemented, most likely. If they were, you would not be required to distribute them to anyone, but anyone you distributed them to would have the right to see the source code to anything you gave them that was licensed via the GPL and wouldn't be prevented from distributing them further. And you couldn't write a new license preventing them from doing so without violating the GPL.