For just withdrawal fees he act like this and tell them they are scammer or a thief? come on dude maybe you should check the network before making complain or atleast you should ask the support on why this happening so that they can enlightened you from what you didn't understand. For that he case you cannot get support regarding on your claims.
Use XRP if you want to lessen the fee or better don't gamble or buy crypto if you can't take any fees towards your withdrawals and deposit.
I totally agree with @ultrloa because no casino will try and profit from withdrawal fees, and Bitsler has a reputation here so I don’t think you’re correct to blame them. Furthermore the withdrawals fees spike happen, and you should do as advised ask the support and then come here and edit your post about the explanation given.
I always say the same thing, if casinos could make everything free for you, they would have done it. If deposits could be sent without tx fee, they would have done it too, if withdrawals were free, they would do that too, if you could move money around from one casino to other casino without paying anything you would do that directly without anything in between.
Casino would like to keep you here, anything extra that they could do to keep you here then they would do it. Hell there are insanely high fees for withdrawal and sometimes some casinos do it for free to get customers. They literally pay your expense out of pocket to keep you here. That should tell you how much they are willing to spend to keep a customer.