Labor is required to build firearms. That doesn't mean I don't have a right to buy one, build one, or own one. I don't think anyone is saying one has a right to have some privacy preserving widget given to them free of charge. The US 2nd Amendment doesn't guarantee that Glock give me a free gun, yet I still have a right to bear one. People generally mean they have a right to not have their privacy invaded by force without due process or be prevented from ensuring their own privacy (such as banning privacy preserving tools). In the case of privacy, the 4th amendment is a similar example of this right. Property rights in general exist in part to protect reasonable expectations of privacy. I've never heard anyone define privacy rights as the right to own someone else's labor. If they exist, I assume they are an extreme minority.