Laws against using something in a certain way does not mean that the something is "not for" illegal things. What things are for and what they can be legally used for are normally quite orthogonal.

A "no illegal uses" licensing term is by no means an unstated default; it is in fact a rather unusual concept.

As fair as I can tell your interpretation of the phrasing is that it implies and only means to imply "Illegal things are illegal", which is a senseless tautology. In reality this phrasing says more than that.