I had rather choose a gambling site that has a free withdrawal even though the minimum that you can withdraw is quite a huge require amount, no one will withdraw a dust amount from the gambling site, and $200+ is quite a good amount to harvest from your gambling wallet. However, we saw that each gambling site has its own perspective way of having a withdrawal fee, I just wonder how they manage that system if that BTC network is congested then they have a free withdrawal, which means they will cover the cost of the fee. Well, that will pretty much lure gambler I think.
When the network is congested, I don't think they will activate RBF to speed up the withdrawal process either. Has someone ever seen a bitcoin withdrawal from a gambling site when the network was congested the transaction activated RBF?