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The only advantage of using ETH casinos, as I mentioned already, is the ability to link our own wallet like Metamask into the platform making the deposit cheaper and much safer. [..]
transactions on Ethereum are still costly but bsc can be used for that. If any casino platform wants to allow its user to play without registration. Where players only need to connect their metamask wallet.
It's your own choice to play on Ethereum-based casinos but if you look at the marketing side of it, Bitcoin-based casinos can easily get an advertisement here, because there are many Bitcoin casino players, and the gambling section of this forum only welcome Bitcoin-based casinos, Ethereum based casinos may become popular in the future if Ethereum can beat Bitcoin
Almost every casino platform that accepts Bitcoin offers the option of deposit withdrawal in Ethereum and other cryptocurrencies so it is up to the user to choose which blockchain he chooses for deposits and withdrawals.
The casinos you're probably referring to are probably Owl.games and livecasino.io so far that I've come across active on forums promoting using the connect to Metamask/web3 method. connecting directly to the wallet I rarely use to play in casinos, I prefer to use Bitcoin or altcoin deposits with low shipping costs such as Dogecoin and TRX.