True, he can just whine or share his disappointment but he should not bad mouth or accused a platform of being a scam when the platform only did what they believe is the right thing according to the TOS.
Exactly what we should understand is that not everyone who is gambling know bitcointalk and it's just a few of us who happen to know the forum and at the same time are informed of the various behaviours of casinos and also their reputation, a lot of cases have been resolved in the board and in reputation board, while it is important to support your case with evidence and if you look around, cases that have proven evidence are easily resolved.
-But it takes time and luck for a casino to lose a case against players because they made the rules to favour the house that is why we are forced to read the terms and conditions of the casino before registering or depositing, stake.com have a good reputation around the gambling community and if ops have a clear case against them I am sure stake.com will be honourable enough to hand out the players cash out amount.