If you honestly can't see it then you need to read a little deeper.
IDM is an obvious exploit. All you need to do is look at a person's character info to see that it's fake. You also have to do a lot of unnecessary changes with item codes just to get a set, equip it, and then use it in a match without crashing. While doing that you can't even change characters.
ITC shows the items in your character info, allows you to add on enchants, esper chips, and use all three characters with legit items showing and no real chance of you crashing from it. It's a one time configurated set of items.
Not that hard to see the difference?