It is said that digital currency is decentralized, so when stablecoins are pegged to US Treasury bonds, is this centralized or decentralized?

The stablecoin bill should only be liked by the US government; any other sovereign nation probably wouldn’t like it. After all, they don't even particularly like US Treasury bonds.

So what constitutes good news? What constitutes bad news?

One can only say that telling stories is top-notch, but short-term benefits in real money are hard to say in the long term.