Did you exchange USDT for USD through the exchange or did you trade USDT for USD, there is a difference.
In the first instance the exchange is on the hook for the USDT and they have to go to Tether to get USD to cover it.
In the second instance the other user you traded with is on the hook for the USDT and they will probably just trade it for USD in the future or another crypto.
In the first instance the exchange is on the hook for the USDT and they have to go to Tether to get USD to cover it.
In the second instance the other user you traded with is on the hook for the USDT and they will probably just trade it for USD in the future or another crypto.