Why is the USDT transfer fee so high?

I've been noticing a rather significant transfer fee for USDT transactions lately. Could you please explain why the fees associated with USDT transfers tend to be so high? Is it due to the complexity of the underlying blockchain technology? Or does it have something to do with the liquidity of the stablecoin itself? I'm also curious if these fees are comparable to other cryptocurrencies or if USDT stands out in this regard. Could market conditions or network congestion be contributing factors? I'd appreciate any insights you can provide to help me better understand this aspect of cryptocurrency transactions.