Crypto assets divide roughly in two. A native coin is the network's own asset, used to pay that network's transaction fees: BTC on the Bitcoin chain, ETH on Ethereum, TRX on Tron. A token is an asset that lives on somebody else's chain and uses its security.
USDT is the best-known example: it is not its own network but a token issued on several chains at once — ERC-20, TRC-20, BEP-20 and others. Same name, same value, different networks.
Why this matters at a casino
Sending a token requires the native coin. The fee is always paid in the chain's own asset. To send USDT on Ethereum you must also hold ETH; on Tron you must hold TRX. A wallet holding only USDT and no native coin is locked — the money is there but cannot be moved. This catches new users out constantly.
With a token the network is always a separate choice. Because the same token lives on several chains, choosing the coin is not enough: the address and the network must match on both sides.
The size of the fee depends on the chain, not the token. The same USDT transfer costs cents on Tron and can cost euros on Ethereum. The token does not set the price — the network does.