While your concerns may have some merit, your take here is a bit lazy. There are certainly some things about tether that could be done better, but it is far from the picture you are trying to paint here. They've been in the business since 8+ years, and have weathered many storms and done billions in redemptions. I don't know what kind of audit you are expecting, but they have certainly done a fair few[1]. They are also not related to Binance in any way.
But more importantly, talk is cheap. If you really believe in what you are saying, there are plenty of USDT futures available in crypto markets. Go ahead and short - if you are right, you'll win big, and the downside is fairly limited.