How are you so sure that every single crypto gambling site out there will make KYC mandatory like Roobet? Can you foresee the future or something? You clearly can't which is why you are simply assuming.
As per the current gambling policies many casinos have accepted the AML guidelines and introduced KYC for the players and in future the government regulations could become more strict putting pressure on the casino owners to implement these norms but these are assumptions at this time so will see how they operate in future.