Institute player accounts with password confirmation sent via email. Limit AOL players to non-free emails (an educational one from a college or university is even better). When you get a problem with an AOL player, ban them. Any new accounts will require a new non-free email. At some point, it becomes costly for them to create new emails that they're paying for just to play a MUD when there are so many others out there they could go to and abuse.
Take care,
Jason
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