Well, as the judge said when I was disputing a speeding violation in a school zone... ignorance is no excuse. If you're going to be using it, you really should know the legal aspects of what you're agreeing to by using it.
Either way, agreed to it or not, it still exists, and could potentially cause trouble for people/businesses that support jailbreaking, or at least those that do not censor information on how to do it. That's all I'm trying to say here. Legal or not, does Apple care? They'll do their best to try and make it illegal and, if they want to, drag you/us/them/mp3car.com down this road with them.