From the arimaa whitepaper:
Although there can be multiple registrars to choose from an individual
or organization can maintain only one effective account with only one registrar.
Right-- good luck with that! Any system that relies on Wise, Efficient and Effective Bureaucracies to decide hard questions like "are these 400 accounts really one scammer trying to get more than their fair share" are doomed to fail if they ever get large enough to attract the attention of scammers.
If you have a really good automated way of telling the scammers from real people that doesn't require them sending in a DNA sample or body part, please let me know. I could use a good solution for the Bitcoin Faucet.