When it comes to withdrawals, casinos have two types of business model:
1. Pay user's withdrawal fees out of their own pocket
2. User pays fixed withdrawal fee
I, as an user, prefer to gamble on a casino that pays my withdrawal fees because I feel like I'm treated better. I don't have to worry about not having enough money to meet minimum requirements when fees are added to my withdrawal. I'm also less careful about my deposit because I know, I'll get back what I left on my balance and nothing more will be deducted.
For me, it's okay to pay withdrawal fees if they are very low and near to real life cases, like, if the fee of average Bitcoin transaction is $0.50 and casino charges me that, I'm okay with that. If the Litecoin withdrawal fee is $0.01 and casino charges me $0.50, that's not okay for me. I prefer fair fees for every kind of cryptocurrency.
almost all casinos are business in business to make money while making sure that they keep getting new users to come and play bets on their casino. Since this is strictly business to get more users, some casinos would not mind to pay for transaction fees of their customers just to see more patronage with time while some would always hold gamblers responsible to pay for their own network fee for every transaction.
Most times, big and branded casinos don't really like to stress their users which is why they would prefer to pay to make the transaction fee low as much as possible to ease off any worries concerning paying heavy fees just for withdrawals. Some casinos see withdrawal as an opportunity to make money too that is why we keep seeing some casinos charging as high as possible for withdrawal fees.