Also, that $1 valuation was supposed to be backed up by around $4 billion worth of bitcoin. If Terra (the company behind UST) starts selling bitcoin to prop up the valuation, the price of bitcoin will also tank.
And since markets anticipate that this is what will happen, the price of bitcoin is already tanking, which reduces the value of the no-longer-$4B hoard, which means they would need to sell more, and you can see where this is going.
That is uninformed and incorrect. UST is supported by promise of conversion into LUNA at $1 per UST, so it is supported by convertibility.
It is unwinding. I have not held either of these.
Those not just making stuff up can read the docs: https://www.terra.money/intro-to-terra
https://twitter.com/stablekwon/status/1503296630396645376
More details: https://techcrunch.com/2022/04/06/terras-founder-plans-to-ba...
It's unclear how much BTC they actually amassed and how much, if any, is left. But at the end of the day, beyond all the techy handwaving, Luna was propped up by essentially Ponzi-like promise of 20% returns and now that has collapsed.
UST has convertibility by burning it at $1 into LUNA. Anchor protocol 20% did not seem sustainable. I looked into this contraption and stayed away from all of it. In hindsight, of course it all seems obvious.