What network does KuCoin use for USDT?

As a crypto enthusiast, I'm always curious about the underlying infrastructure that powers various exchanges and tokens. With KuCoin being a prominent player in the cryptocurrency sphere, I'm particularly interested in understanding the network that supports USDT on the platform. Could you elaborate on the network architecture that KuCoin utilizes for its USDT offerings? Does it rely on a decentralized blockchain like Ethereum, or is there a proprietary solution at play? I'm also keen to know if there are any specific advantages or considerations that led to the choice of this particular network for USDT transactions on KuCoin.