Forks are generally required to maintain the original licensing of the originating source. That would be like taking part of the Windows source code and "forking" it with the only change being the licensing. Just because you forked it and changed the license doesn't make it true.

^ this

Also: what would forking have to do with anything? If youre compelled to put a backdoor in code to be able to intercept messages from a particular person, a better argument would be to just say "lol idk how 2 do codez" as opposed to "lol im gonna fork, fuck off"