It's engraved.
1) You're uneducated on these issues, and only showing yourself as ignorant to anyone who knows better.
2) You should have the sense not to say things like that even if you thought they were true.
I'm pretty sure most of the reaction you're currently drawing is related to your response, and quoted above - many people here are honestly curious why you have a problem with registering your device to update Apple's warranty database. Your response, in return has been: "you're uneducated; you don't know what you're talking about", etc.
It's actually kind of amusing to read, because it sounds like someone who's been cornered because he can't answer a question that he's acting like an authority on. "Well, I can't be bothered to teach you about it, if you haven't taken the time to read about it yourself. You should already know. You're ignorant. You..."
Anyhew, it would go a long way to improve the thread if you just explained to people what your issue is. Personally, while I was annoyed that I had to connect to iTunes before I could use my touch - as mentioned before, for the App store and Music store to function, Apple needs to know your Apple ID. *Shrugs shoulders*. I've already got an Apple ID, so they're not gaining any additional information about me other than I own an iPod Touch; which they would have learned as soon as I used the App store for the first time anyway. What's more, they now know my purchase date for any warranty work that I may need, and they have my iPod's serial number on file in the event that it's ever stolen. I don't see any loss of privacy that's occured.