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.
As a regular before. Altcoin is indeed the best alternative because you will just need to send your Bitcoin on Exchange to convert it on Altcoin then problem solved. I’m not knowledgeable on LN of Bitcoin but I’m sure that you still need to send it to a wallet that offer LN like Munn wallet which means it’s still need fees to send.
But LN is really good implementation to a casino so that Bitcoin holder can still hold and gamble at the same time. It’s just not that popular and a waste of resources for casino side.