Some months ago, I needed an urgent $20 to cover a transaction elsewhere, so I decided to withdraw it from my new broker account. Thankfully, I detected an insane charge of 8 USDT just for a 22 USDT withdrawal before proceeding. What would remain?? 
It's insane withdrawal fee but you must check exchange information on taker, maker and withdrawal fee before deposit.https://exchangewar.info/
https://www.cryptowisser.com/exchanges/
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They even cited that the charge was for "mining fees." Are you kidding me? Mining fees for USDT. In short, I rushed to the live support, and we had a very heated argument that later made them apologise
It's surprising information from the broker, but sure if you use any centralized platform, you will never stop surprising with their policies that can be weird to earn as most money as possible from customers.Use this website for checking basic information on USDT fee on some famous blockchains, it's on chain fees but exchanges can change their withdrawal fees higher if on chain transaction fees are expensive.
https://gasfeesnow.com/
There is a heatmap for you to choose best hours to make your transactions on chain, it does not apply for withdrawal fees.
https://gasfeesnow.com/heatmap/