I, as an user, prefer to gamble on a casino that pays my withdrawal fees because I feel like I'm treated better.
There's no one in this world want to spend more than what it should be except they're an idiot.
I kept thinking if there is any casino that pays every users withdrawal fee, I doubt there should be any available in the market. What exactly is the point of doing business and getting more profit for site maintenance and others if withdrawal fee can't be a priority, it's not ethical at all except it should be a promo for newly registered account to allow withdrawals without fee on the first three times.
I believe it is not good for the business if they will cover the withdrawal fee for all users. Just think of those winners who should be paying for fees and they will get it out for free? So for me, the casino can charge fixed fees for withdrawal but there should always some fees as they are also paying for that no matter what. Because if they will not, the fees will be deducted from their income. Sure, it will be a good feature for the gamblers but they need to consider their operational costs if they will do such move.