The email lists solve some problems that newsgroups, IRC, and chat rooms have.
Email is quick, easy, convenient, and the most accessible.
Not everyone knows how to subscribe to newsgroups, or to enter chat rooms, or even have the access capability to do so, but anyone with an email address can have access to these lists. The age policy will be strictly enforced on the lists. Although there is no absolute way to guarantee that a subscriber is within the proper age range, if it comes to the attention of the ListOwner that a particular subscriber is over the permitted age, the subscriber will be immediately removed from the list.