Exactly, I personally prefer gambling in USDT because of the stability, it helps me know exactly how much I am gambling away so that I will know where and when to draw the line, but like you said, another problem that turns most gamblers off from using USDT is the fact that anytime you are depositing from an exchange to the casino, the gambler spend not less than $1, this is for normal blockchain networks like BSC, Solana, Tron chain and the likes .
This is why i believe that most gamblers now prefer gambling with other cheaper coins like doge coin, shiba inu and so on.
The USDT withdrawal fee for the $1 range is not a high withdrawal fee because they choose to use a stable coin to maintain the stability of the value of the deposit added to the gambling account, instead of using other coins there will be a risk of depreciation due to fluctuating market movements, but we expect some other networks to BSC, TRC20 will soon be added for deposit and withdrawal network to lower withdrawal fees.