Why is sending USDT so expensive?

I'm puzzled about the high cost of sending USDT. I understand that cryptocurrency transactions involve complex processes and may require some fees, but the cost of sending USDT seems disproportionately high compared to other currencies. Could you please explain why this is the case? Is it due to the volatility of the crypto market, the complexity of the blockchain technology, or some other reasons? Is there a way to reduce the cost of sending USDT in the future? I'd appreciate it if you could clarify these points for me.