From player's point of view, of course we want the casino as the one who cover the wthdrawal transaction fee.
If the fee is not high, I do not mind to be gambling on a gambling site like that. I do not mind the fee if it is low. This is the reason I prefer to use stable coin to gamble and choose a blockchain that has low fee like the BSC and Polygon. But if the fee is free, it is not bad also if the gambling site is trustworthy.
From casino's point of view, as they are running business so it is reasonable if they do not want to cover withdrawal fee and prefer to charge it from the remaining balance or from the withdrawal amount itself.
If gambling sites are not charging for fee, they will still have more profit but just that they want more moneybas a business. Gambling sites with enough customers can never go broke.