I can't believe I didn't check the trade history to know this. I knew BUSD was feeless meaning you can buy any asset in the spot market and pay zero % fees.

But I noticed many times that fees were indeed deducted for my market orders, I did some googling and noticed it was some sort of a limited time promotion.

But today I made a limit order for the first time in months and checked the transaction history, it's fee less!

So market orders have fees associated with them even on BUSD pair, but Limit orders are fee less.

TL;DR: Use BUSD+Limit orders to make feeless transactions.