That is crazy. Just 2 days I was trying to send 215 USDT from one of my exchange wallet to another exchange and the ERC20 withdrawal fee was 17USDT though luckily both the two exchange also have the option for TRC20 wallet address and I chooses that for the same transaction for a 1USDT fee. Look at the difference. This same issue have not allowed me transfer same usdt to another exchange I also wanted to use but that didn't have the TRC20 just ERC20 and i ended up not doing that transaction cos that ones fee was 20USDT.