It is normal that a platform will never reveal their weaknesses. If they reveal how they are detecting user fraud, then of course they can easily cheat by using other techniques to protect those things. When any kind of bonus is offered on a casino site, they abuse it in various ways which are very important to detect otherwise they will not get many new users by offering bonuses but some abusers will enjoy them by cheating. So casino platforms always use new techniques to catch fraudsters but never reveal their techniques but still abusers can be success on there operation some times.
Don't get it twisted nobody is asking them to reveal how they caught the cheaters that's a wrong thing for them to do but pointing out exactly what they did like how they cheated wil be well appreciated. If the cheaters do that using the bonus the casino should simply say they abused the bonus they was given to them that's a good way to send a warning to those that was caught and those who plan to abuse the bonus that will be given to them in future. New players will definitely join the casinos if they are aware that the casino doesn't delay payments after a withdrawal is made they will also try to avoid cheating it they know that the casino frown at it after they have exposed cheaters.