Isn't this an easy opportunity for arbitrage? Assuming it goes back up to $1. I thought that was the whole point of fiat-backed crypto?
The fact the Tether who issued USDT for presumably something around $1 aren't buying it back themselves for an easy profit should tell you something.
This is actually why it's so hard to tell from this whether or not this is something bad or just "normal" because tether price always reaches lower levels like this when people get out of it to buy cryptocurrencies, too.