From what I understand, things like spoofing in financial markets (where you submit orders which you don't plan to have filled for the purpose that the market sees "interest" in a certain direction and in hope that moves the market), are regulated but still a grey area. The reason for this is that it's an activity that involves intent. Placing certain orders is perfectly ok if you're hoping that they get filled and you take a position, but placing the same orders could be spoofing if your goal is to cancel them once the market starts moving as a consequence.