Being richer and have more money in pocket are not helpful if he does not intend to save USDD and TRON. Do Kwon made a bad decision to choose one and leave another die and what he chose is simply a serious mistake. If he chose $LUNA, he should save it rather than kill both tokens. Terra Foundation Guard used their reserved to save UST and failed. In the end, they lost most of money and can not save anything.
Justin Sun from beginning of the USDD de-peg crisis chose a good way to handle it. Spend money and try to handle the crisis. At least now we can see USDD gradually reclaims its peg. It is supported by general market too. Personally I still feel unsafe with algorithm stable coin, not only USDD. We don't know how bad the market will be and company can not make over collaterization forever. It has limited capital in pocket.
Justin Sun better play his cards right for the good of the crypto/Blockchain industry. Otherwise, another collapse like Terra/LUNA will further diminish investors' confidence into cryptocurrencies as reliable, long-term investments. You can bet prices will further decline if something like that happened now. Last time I've checked, USDD's peg was restored so I guess Justin proved me wrong. Still, USDD is a risky algorithmic stablecoin so I'd proceed with caution just in case. With regulators paying close attention to crypto's latest developments, we might see investor protections further down the road. Who knows if USDD becomes the first algorithmic stablecoin to hold its peg for generations? Just my thoughts

No, it cant hold for long, its printing money and do you really think that they will use their own money to bail out people if USDD value crashes?