I'm wondering how many people are shorting USDT on Kraken? The potential downside is having to pay interest. The upside is 100% win. With enough short position, Tether will run out of funds and the price will have to crash. Disclosure: I'm short USDT.
If they were smart and brazen, I think they could have possibly pulled it off. One would have to study the market inflows and outflows.
This type of pump and dump would show up in their books, so a thorough audit would find it. But it may mean that they have a lot of USD now. Thus I am unsure if USDT will technically crash.