Not really technically possible without making players identify themselves when they start new accounts or something. IP's change all the time.
The only think I can think of that wouldn't be CRAZY intrusive is to associate phone numbers with accounts and text access codes that they have to enter when they register. Then you could Ban Phone Numbers. Just don't accept google voice or similar kind of throw away numbers. But would be kind of a pain in the ass, and probably not worth the effort.
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