Why did Tether even need to type in 50mill or 5bill? If they really had usd deposits first,then they should be able to auto match the same figure into usdt. Hell even a simple copy n paste from usd to usdt would work.
Tether claim they wanted 50mill usdt, but they "accidentally" minted 50bill, then to fix the "accident" they again "accidentally" burnt the wrong amount..