I unlocked the account, I don't see anything wrong with your account and I have unbanned you. I will ask the moderator why they made that decision, it was probably an error!
Or maybe for security. Its not unreasonable for them to freeze any accounts with large balances in order to secure the liability into a cold storage. Not ideal but not unreasonable.
The reason for the lock was because of illegal content on their links. Personally I'm okay with all sorts of pretty grey area things but it's stuff that I don't even want to mention for the sake of his credibility of a webmaster. Straight up no-go, I remember now seeing advertisers complain about it. I'd rather just pay him out his balance and block that domain from even showing up on the network than be associated with that kind of content.