I honestly believe they are tracking the bot. I tried real hard to get my 72 hour suspension overturned but they wouldn't have it. The reason:
""When running, the World of Warcraft client may monitor your computer's random access memory (ram) and/or cpu processes for unauthorized third party programs running concurrently with World of Warcraft. An "unauthorized third party program" as used herein shall be defined as any third party software, including without limitation any "addon" or "mod," that in Blizzard Entertainment's sole determination:
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Following a review of your case, we can confirm that such program has been used on several occasions by your account, and that the subsequent action taken is appropriate. We would not look to enter into any further communications on this issue as the matter is now considered closed."
I don't think they are stupid to insta ban everybody they catch running the bot because it would mean a big loss of game subscriptions for them, but i think they're stepping up recently with the 72 hour suspensions to try deter people from continuing to use it