I have seen that Tether is not backed 100% by USD dollars. They claim to backed also by loans and other digital assets. It is not a problem at all until debtors will not stop paying their debts, but it is happening, right?
USDT is a stable crypto, it can't be like a fiat dollar, but USDT is a crypto that saves many people from huge losses. I think a day trader must use USDT to keep the value of their assets safe.