4,000 BTC just pegged out of the Liquid bridge. The OP_RETURN says "we are whitehats. contact us on chain."
White hats don't drain a bridge and then solicit an "on-chain" contact. This echoes the Ronin hack, where attackers compromised validator keys to steal ~$625M, and the "let's talk" framing is the same move Euler's attacker used to negotiate a return after the fact.