the artists that they're using are "two of the big artists from the Dramione fandom". It's very much drawing on the fandom and the pairing, as well as directing new people to the fandom

And this is bad because? It sounds uncomfortably like you are saying that HP fan artists should be boycotted or shunned, and Illumicrate is bad because they are not shunning them. Please tell me that's not what you're saying.