Lightning network doesn't get much attention and I think this is the time it should be introduced by casino to make it as a option for people to use for transfer and deposit. But for other still not knowing it much really better if they could just transact any altcoin which is available as alternative since for this we don't need to think about other technicalities but rather we can save up some time buying those altcoins we want to transfer then gamble or just sell it on exchange.
For 11 altcoin available as an option for sure we can still enjoy those casinos we want to gamble. Also if they are doubting about other matter especially for volatility then as mentioned USDT will be the best option for that since for sure we can easily deal with it especially the fees to be taken if we are worried to much about this.
I don't think it's easy to introduce the Lightning Network to casinos, I just think even a few exchanges are implementing one and the withdrawal of the Lightning Network is still a few can count on the fingers of any exchange unless all exchanges have implemented this then it will be easier for casinos to implement it, so in the near future it will never happen.
Altcoins remain the best option among gamblers, compared to bitcoin which often experiences more congestion avoiding this transaction and switching to their preferred altcoin.
I don't think volatility will affect gamblers, they always spend the money on average, if they win, they will withdraw it immediately and won't keep it too long in the account so volatility is meaningless, unless you are really afraid of it then choose stablecoins.