I can understand why one might want to ban a language that has the entire problem solution built in (though such problems are generally not interesting anyway), but many problems seem to just exclude languages the problem posers have some grudge against. For instance, LEONARDO is "All except: ERL JS PERL 6", though I can't imagine a reason that any of those languages would have any advantage when solving the problem. I noticed another problem at one point that excluded all LISP derivatives, again for no apparent reason. Is there a way to discourage this sort of behavior?