I think the problem is when KYC is required only when the user tries to withdrawal the money
Personally, i dont mind if I deposit the funds and the support says something like "Your AML score is high. Please, do KYC or we will send your funds back to the same address".
But taking the funds hostage and demanding KYC is quite unfair.
BUt I don't know any cases of similar situations which happened in betfury.
Yes, it's true that such treatment is actually unfair to gamblers to accept their funds during deposit, but only to reject and sick for KYC whenever they try to initiate a withdrawal from those casinos. And when it comes to "betfury" I can also say that such news about such situations seems not to be common as others. And if casinos could reject deposit just the same way they reject withdrawal when a gambler hasn't completed KYC, it would have been very interesting. But due to greed, casinos will never do such a thing.