Could you share information like which blockchain you requested in that withdrawal?
I guess it is not ERC20 chain that has more expensive transaction fee than most of other altcoin blockchains.
For USDT withdrawals, they only support ERC20 network.
By the way, the transaction fee on ETH network isn't really expensive these days.
If you check the ethereum blockchain, you will see that USDT transactions are confirmed with transaction the fee of around 0.0001. I remember ERC20 transactions were much more expensive in the past.