I have been using the TRC20 USDT instead of ERC20 USDT since the end of last year. If you are seeing the fees has shown zero and it's caused by the fees that have already applied in the tron blockchain is very very small. I will not use the ERC20 USDT again and it looks like more and more exchange sites have supported the TRC20 USDT.

We just need only less than 10 cents to send USDT. that doesn't matter how much quantity of the transaction.