If the user is informed that the button they are about to click will mean that DNT is enabled and that they have to manually turn it off if they don't want it should be good enough.
Although I assumed what all this meant is when you got to that part of the setup the box will be already checked and you had to click on it to turn it off.
Either way, if an attempt to inform the user of the option has been made before they click an "I Agree" button, then that should be good enough.
But honestly, I don't expect many people to honor the DNT header anyway. What's going to happen if they don't, get a strongly worded letter from somebody?
Although I assumed what all this meant is when you got to that part of the setup the box will be already checked and you had to click on it to turn it off.
Either way, if an attempt to inform the user of the option has been made before they click an "I Agree" button, then that should be good enough.
But honestly, I don't expect many people to honor the DNT header anyway. What's going to happen if they don't, get a strongly worded letter from somebody?