To understand all the advantages of the Lightning Network, you must, of course, try to use this network yourself. This is not difficult. By the way, after the legalization of bitcoins in El Salvador, the use of LN there has grown many times over. Of course, at first it may seem difficult when you need to block a little Satoshi in the channel. But then everything becomes easy.
I support those casinos that will introduce such a form of payments as LN. The more such casinos, the better.
The use of lightning network increase when some wallets and exchanges like CashApp supported it, it increased further when El Salvador made bitcoin a legal tender but I do not think it is because of El Salvador users that the use of lightning network increased because people using bitcoin in El Salvador are not yet much and most of them use Chivo wallet for it which has cheaper fee because it requires no on-chain transaction.
So it is possible that some casinos or p2p exchanges may use LN since it has a cheaper fees and faster network. And if casino use lighting network it will be of a great advantage to their players but we must not also forget the fact that lighting network is a new development in the Bitcoin ecosystem and not everyone is cool with using it at the moment.
Lightning network will make fee cheaper, the transaction time is also faster. Lightning network is still under development but the project is not more new. Gamblers can make use of it for low amount of money which is what is encouraged for it to be used for.