USDD is more his way to offload tron without killing the price. Seriously Justin sun minted 94% of the supply from USDD.... even those guys are just exit scammer / or Ponzi. Another algo stable goes to dust with one guy making money from it.
Not to be a hater but Justin Sun is really a pro ponzi scheme artist. The introduction of USDD is timely aftet the downfall of UST meaning he just want to show off that with this move, he can overruled the fear by other investors on what happened on its fate. But literally challenged the system for what? People fomoing and mostly USDD supply probably is on his disposal.
It will take some time before it happened to tron, but if Justin will be careless like Do Kwon, its not impossible especially there are lots of whale hate Justin Sun.