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I think the terms and conditions of the casino are clear so what the Op said is invalid and he is in the wrong party, and players shouldn't always say the casino is committing fraud even though the mistake is on the player's part, and I don't think the casino will just ruined his business for $10 money, which due to the change in value became that much value, because maybe the first time the funds from the referrals appeared were worth very little.
There are some gamblers who are so lazy they don't even try to read the ToS. They should have read the ToS when they registered in the casino, but they joined the casino without reading anything and later faced the same problem as this user. Since this user's amount was small, he will not face so much problem even if he doesn't get this withdrawal, but imagine if his amount was big, then this user had no option to withdraw that fund. He tries to suppress the fact by attributing his mistake to the owner's rude behavior. It is easy to understand that no casino will make any excuse for only $10 not to allow that user to withdraw! No one wants to ruin their business name for such a small amount of money.