On Binance Smart Chain (BEP20), the fee is much more lower, BNB and USDT are both on BSC, the fee also is both low and should be the same.
This is why alot of users are moving to Binance Smart Chain. It even cuts across the binance pegged BUSD which is even zero charge or less than nothing when moving it from binance to some apps. On the contrary, the high fees of bitcoin and ethereum withdrawals is nothing to write home about. The high charges makes you conclude that traders and investor's concerns are not considered at all.