"Why is Cryptic so mean?" you might ask. The latest dev blog explains that that's not the case at all. Noel "Destra' Holmes has quite a bit to say about the ongoing issue of IP violations, but it boils down to this: "The requirement to remove IP Violation characters from Champions is completely based on the fact that having IP Violation characters in our game puts us at a legal risk, and the unfortunate fact of the matter is that we are required to remove them from our game, or the owner of the IP in question can take us to court for stealing their stuff."
The full blog entry is very informative, and well worth a read for any Champions Online fan.