I don’t understand why you care that much on the network of USDT while you can use TRX token directly for withdraw and deposit since it charge much cheaper fee compared to TRC20 USDT. The deposit balance automatically convert to USD balance on casino wallet so I don’t see any advantage of using USDT on transfer.
FYI, I’m a regular player on Duelbits, What I mean is you can use TRX to deposit and withdrawal to save fees then just convert it back to USDT of your choice on exchange if you preferred stable coin. The token/coin that you deposit on Duelbits is automatically converted to USD the moment you deposit it so the initial token that you have is already negligible once you deposit on the casino. We are just talking about transaction fee here and TRX has the cheapest transaction fee to do this.
Simply when you deposit;
TRX>deposit in duelbits>USD
USDT>deposit in duelbits>USD
While trading fee on exchange is almost negligible if you are just converting an amount less than 500$.