Not only that you save a lot of fees and time if you deposit or withdraw altcoins like Doge, trx or Litecoin, but at the same time, you can bet or gamble with very small amount. For example, you can bet or gamble with (example) 10 trx etc and even if you lose, it is only pennies. I think there would be a very small percentage of gamblers who would be using Bitcoin or Ethereum for gambling purposes. Even stable coins like USDC or USDT are also very popular, but I prefer TRX or DOGE (my favorite coins for gambling

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AFAIK, The last time I play here on Betfury balance was converted to $ when you are playing which means bet value is still in $.
Those small bets is only applicable on some games like sports betting perhaps but if you play slot games or live games you will still need to bet on $ minimum bet even though you are using an altcoin currency.
minimum bet on most games are on $ not on altcoins value. CMIIW