All these days, it was free or zero cost to withdraw USDT TRC20 but suddenly from today, they have changed it to 0.20 USDT. I don't know if BUSD fee was 0 from the beginning or not but now it has been decreased to 0. The target is to boost the use of BUSD. This is the manipulation of Binance. There’s more to come.
I just checked it and it's still 0 for me. Maybe some glitch or a short time thing. (Or maybe that was a new address)
They are surely trying to promote BUSD but going so different from other exchanges and taking fees on withdrawals that don't require one would bring backslash for the exchange.