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.
Since the deposit of TRC-20 USDT has increased massively, binance are trying to get some money off it, I just checked mine right now and the withdrawal fee for trc20 usdt has increased from 0 to $1 now, I don't know if they increased it from this $0.20 you saw, seems like they want to use this opportunity to promote their BUSD that isn't listed on much exchanges, since it's a centralized platform they can do whatever they want, we users can't do anything than to pay whatever fee they ask from us.