We do not require KYC any of the players if the player does not violate the rules, we can request KYC if the player is suspected of cheating , betting on contractual matches, multi-accounting
though gamblers have the responsibility to read the casino's ToS, it would still be better to clarify the KYC rule from the start. I've seen gamblers complain about being asked about KYC usually when the gamblers try to withdraw when the gambling site states "NO KYC".
Yes we are sure of it, the amount does not matter, breaking the rules is the only case when we can request it