Every word in a list gives them more leeway. Beware of granting power by using adjectives. Let lawyers fill in the exceptions and lists.
The Canons of Statutory Construction are important.
3 is not good, as it seems to grant lots of power to censor. What is illegal, anyway, takes a court to determi e. Why can't the Forum just present what is posted, period? The Common Carrier idea grants no power to remove content. The Forum should not determine what is illegal.
4 is very good and well stated. Its why I reply. If I had one input it would be to advance this wording of this idea. Excellent.