How about this theory: I can print USDT (by fiat) and buy BTC with it. Now I have a large amount of BTC and propped up price. Then CME starts trading BTC futures against real USD, coincidentally the trading starts at the very top of BTC price. Then I start selling both BTC for dollars AND BTC futures again for dollars (cash settled on expiry). I am making real USD and only started with USDT (supposedly backed by nothing, best case by my BTC wallet). Now that prices are 50% lower and I have tons of USD (or just print more USDT) I can start buying again keeping the price acceptable and ready for another pump before I start selling the next BTC futures contract.
Is this possible. Am I missing something?