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.
-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.
Or with this simple and baseless accusations, the casino's reputable is destroyed unless they gave to the players, on what they "think" is right in this case. Nevertheless, there is this kind kind of protection that casino need to put so that they will not be abuse by players as well. I'm not saying that the OP did it on purpose, but he might not be aware of the ToS and the protection that others and I have been saying based on our own experience. Those delays are needed as the results can change instantly.