If I remember correctly, the fee for making a USDT transaction on tron blockchain was around $3.5 worth of tron while on ethereum blokchain it was around $0.4 worth of ethereum.
Tron has lowered the network fees on its blockchain a few weeks ago by up to 60% I think. It's still pretty expensive to move tokens even with this update. Currently, the transaction fees are around 6.5 TRX or just above $2. They are probably even lower if the receiving address has TRX.
I don't have account in that platform because their services are not available to people from country, something I find very strange, I know the fee is high. If they can add Litecoin and Withdraw via USDT Bep20, then those will go with very low fees. Most of the popular casinos already have these options to make it easier for their customers because $2 is such a big money that can earn you several spins in slot game.