After the Balancer hacker exchanged the stolen ETH LST tokens for ETH, they began to launder the money through Tornado

According to on-chain analyst Yu Jin's monitoring, the Balancer hacker started to launder and transfer ETH through Tornado after exchanging ETH LST tokens and other non-ETH tokens for ETH: in the past hour, 2,000 ETH (6.36 million USD) was deposited into Tornado.

Transferring stolen assets through Tornado essentially means that the hacker has given up on the option of returning the assets to Balancer and claiming the white hat bounty.