Betfury may, at its discretion, request any user to complete KYC at any time. I think this requirement is the same for everyone, i.e., it doesn't matter if you are playing casino games or just betting.
By the way, pay attention to what is written in 17.1.4, 17.2, and 17.2.1 of their
ToS.
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.