I think I saw this a little differently, the account the user was trying to cancel shouldn't have had any information attached to it anyway. So by OnStar asking

I think I saw this a little differently, the account the user was trying to cancel shouldn't have had any information attached to it anyway. So by OnStar asking for personal identification on an account that (probably) doesn't have any information to begin with seems a bit ridiculous. So to prevent fraud, I can imagine most users who actually use the account already have real information attached to it. So pushing for personal identification before removal makes much more sense in that case.