I can't remember the exact NC$$ site but a 'fan' is considered a booster by the NC$$.
I wouldn't be worried about the NC$$ doing anything to me as a fan/booster but since in their eyes I represent UND, they can certainly do something to the University. Last year when I was involved with others in planning a neighborhood BBQ and a few of the players were invited, I spent a lot of time researching for possible adverse implications/rule breaking. This is a big deal and many sanctions have been imposed for what we would consider non-issues. For example, a motel gives out coupons for free or discounted breakfasts to all their guests, a recruit was given a coupon and this was found to be a violation of NC$$ rules. The recruit went back and paid for his breakfast. Stupid? Yes but we are talking about the NC$$.
As a fan, if I talk up UND to a possible recruit, I and he/she are breaking NC$$ rules and the school is subject to sanctions. Don't believe me? Do your own research. It's quite an eye opener.