Lightning network is faster so withdrawal and deposit should be much faster.
But there are no other benefits for casinos, there are only downsides because Lightning is not decentralized like Bitcoin and we dont know what type of wallets casinos are using.
Anyone who is promoting Lightning is promoting some company provider, that is not bitcoin.
I believe not. Because from the casinos viewpoint, they don't care if it's centralized or decentralized as long as the money comes in into their ledgers. Many of the most successful casinos also accept fiat, no?
Plus in whatever form casinos accept Lightning, custodial or non-custodial, it would always be a benefit to Bitcoin because the Bitcoins in the Lightning Network are actual Bitcoins that haven't been settled on-chain yet. Another benefit is using Lightning promotes the use of technologies on top of Bitcoin whether custodially or non-custodially.