That is a tough situation. Other than simply finding the STEAM IDs of each computer at the cafe and banning them individually (which would seriously hurt the business of the cafe), any admin on the server should just ban him when he comes. He'll eventually exhaust all the computers in the cafe, and I doubt he would be willing to move to a different cafe.
Then again, he does have to install the hacks on each computer, which is a hassle in and of itself, so he clearly does not mind making the effort to do so.
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