"Tether converts cash into digital currency, to anchor or tether the value to the price of national currencies like the ... So 1 USD₮ is always equivalent to 1 USD."
They say that 1 USDT is equivalent to 1 USD, but don't actually mean it. Read their disclaimer that I posted above.
Even if it is backed 1:1, it still doesn't trade 1:1 most of the time..
Whenever there a major crash, or a major pump, USDT either devalues / becomes overvalued, which makes sense, but is also kind of weird at the same time, since you would think that would correct rather quickly.
It fluctuates ~0.5% daily, and with major events up to 3-4%?