Why I don’t gamble with Bitcoin is because of the recent rise in the cause of transaction, I am more comfortable holding my Bitcoin and gamble with other coins must especially if the gambling site allows deposits of altcoins that are stable in price.
There's no altcoins that are stable, unless you are using stable coin itself, the popular stable coin is USDT and it's still high in transaction so you can use it in gambling as i think there are also few sites who are accepting usdt.
I better use altcoin than bitcoin or stable coin. Besides the fees increase on the transaction, I feel that it is better to use USDT for trading pair with altcoin or bitcoin because that can help me make a profit.
Using bitcoin or altcoin will be our decision and I think some gambler still using bitcoin because they think that if they win in bitcoin, they are making a lot of money from that. But I do not think that they will easy to win in gambling games.