It never occured to me that casino / provider access to passwords was an issue, since they have access to everything anyway. However, in the light of GM's remarks about encryption, this is going to need some explaining away.
If this player IS a fraudster, then he must be the fraudster the most deserving of sympathy of just about any out there. Fraud against Fraud Cloud - how immoral is that? Cloud was ripping players daily in his Rated Player / Extreme days. I recall one player, whose testimony I trust completely, saying Cloud literally stole $1800 straight from his account, claiming he'd lost it playing roulette. This was back when there was no RTG backup of any kind and the player had little recourse to mediation. Now this thief, having built his business bankroll on robbery, much as Golden Palace did, is trying to whitewash his image and "go honest", so that he can take the moral high ground when one of his own kind try to put one over him - how ironic is that?
The mistake this player made was not knowing what he was up against. Cloud wrote the book on fraud. He knows the subject backwards. If you're going to take him on at his own game, at least do a good job of it - not this kack-handed attempt with multiple signups with identical names and passwords. This is kiddy stuff to Cloud. If you're going to fraud a fraudster, do a better job than this.
I don't support fraud in any shape or form and I don't want to swell Bryan's PAB section with illegitimate claims, but I have to say: if you must do it, this is the place. Take on this creep for all the money he stole off his players back when it was REAL "wild west" territory and he could get away with it. If you can get away with it, more power to you. Just DON'T be wasting anyone's time looking for mediation you aren't entitled to. Take it in the gut and move on.
And good luck to you.
OK, hope that Incitement To Rebellion hasn't broken too many forum rules.