Good news, isn't it?
How on earth it can be a good news?? Having 4 billion USD worth of crypto assets in the hand of an authoritarian government!! It's good that a ponzi scheme is busted but Chinese government is not at all favorable to cryptocurrencies.
I don't know what Chinese law says, but in general for any such kind of financial frauds, the government liquidate the seized assets and return the money to its investors. That liquidation happens in fiat currency so I assume Chinese government will sell off the seized crypto assets. That's not a good news in this bleeding market!