Hmm, he owns/ controls Poloniex. I think there are a lot of combinations to "use" his stablecoin and blow it up.

If nobody ever wants tron back, the ponzi works.

So it needs only to run as long as he need :D And at some point it bust, print more tron and he promotes everyone can be Tron billionaire for 1$.

It would also bust if Tron falls from 0,06$ to 0,006$.

Luna had the same problem, a to big % move can be dangerous.

More interesting is the way it could tron moon.

Tron into USDD, USDD buy more Tron, into more USDD, and so on.

Rug the market with large stake to create USDD ( his foundation stack for example) and not all at once, dump it over time.

The cash cow is born.