If you cash out by bitcoins at a casino and the casino doesn't add enough fees for fast confirmation. If the price of bitcoin drops a lot. Should the casino be held responsible for the price differences in which you cashed out at and the current loss in btc prices?
I think yes but no any casino will be willing to take this responsibility. They only update their system when someone report this issue to them and what best users can do is to either wait for confirmation or use tx accelerator services like viabtc tx accelerator to get faster confirmation.
I think the tx fee are very minimal as compare to the earning of the casino. So no casino will put a less tx fee, just to delay the transcation and ruin their reputation. If a casino does this, no one will come back again to the casino to play, so it will be a blunder for a casino to put low tx fee. A good casino should put a high tx fee and no deduction of fee to give their customer a better playing experience and therefore a boost in their own business.