For the matter of copyright infringment or whatever. I have been playing WOW for a while now. Blizzard does allow 3rd party programs, to AID in the gameplay. Simply Blizzard allows addons where the player (person) is still in control of their character and operating the computer (game). Anything other than that is considered a violation of the EULA. Anything that is considered an exploit or hack is in violation also. The rumored toolbox. which allows a character to edit their stats, essentially going up and one shotting a boss, well obviously that is a violation, as it conflicts with the original manner of gameplay mechanics. Within WOW, there is a fine line between hacks, cheats, exploits, and strategie.
I havent read what "Bot" this guy was using. But if he was using anything that effected any other character, group, or the economy of the server for personal gain, he will be dealt with by blizzard accordingly to the full extent of the law.
And so fo the copyright portion, from my ideas on it. If the person bought a WOW client, and purchased an account, blizzard grants them ACCESS to the server. Under the EULA, the user agrees when logging into the game the first time, that from then on, using their account they are by law to follow the EULA. Stating that they are not to upload any 3rd party programs that effect the world of warcraft environment, enhabitants, or economy. Along with many other things. If this person created/sold a "bot" that did so hes in violation of EULA, and EULA being a contract it is not a copyright issue. However, one could say that him selling this program IS copyright issue. As it is a transfering of data that withholds information that BLIZZARD has copyrighted.
For an analogy. Since CDs are a big issue with copyright. A person goes and buys a CD from a store. The person goes home and plays the CD. They dont like how the CD sounds, so they go on their computer and create a mix/remix of the CD and sell it. The person uses the same tempo and beat, but changes the lyrics. (weird al yankovich has been sued by almost every artist he has done parodies of. Coolio with Gangsters Paradise, weird al doing Amish Paradise)
Now its not the SAME thing. But copyright law doesnt state that it has to pertain to COPYING, just because its in the name. It also has to due with the alteration of the original media for resale. This of course has to do with copyright laws of media, as there are different types. So this guy selling a bot/hack with blizzard data on the program IS a copyright issue.