[Wayne Luke]

I am not missing any point.

Its an OPT-IN program. If you feel that there is not enough information than do not opt-in. It really is as simple as that. It isn't required to associate a Google Publisher ID to use vBulletin 3.8.0. The functionality isn't even included unless you opt-in before downloading. You still have complete control over your own Google Account and you can Opt-Out at any time.

By choosing to associate your account, data is only shared based on what Google provides under their privacy policy. Which is agreed to when someone signs up for that program. You can re-read it here:
http://www.google.com/privacypolicy.html

Google still controls all the data about your account. If you Opt-in then you agree to share it.

You make it sound like you can't even use vBulletin 3.8.0 unless we get your publisher ID. Even if you gave it, you still have control over it and it isn't associated until you give vBulletin.com access through your Adsense account manager.