Well it could be one of those mixing services that are created and operated by FBI! Or it could be the one which has agreed to share data with the enforcement agencies for every big transactions. FBI and other enforcement agencies know this for a fact, that criminals who steal funds from others, will always try to mix their bitcoins to hide the trail. So it's not a surprise that they still allow certain mixing services to run in exchange of data.
I thought so too because months ago, we had news with some mixers like CM, SB were seized, sanctioned and so on, but announcements officially mentioned these mixer names. It's very different than this one, no mixer name was written in the announcement. My theory is the latest one is a honeypot from FBI, DOJ but previous seized/ sanctioned ones are not from them.
The good part is that, the criminals were arrested. Bitcoin should not become a free heaven for criminals like these people. They have NFT markets to play with where they can purchase a stupid looking monkey image for millions of dollars!
Criminals are everywhere and governments just don't complete their jobs, but they want to aim at Bitcoin, mixers as their favorite targets to shut down basic human rights of their citizens, privacy.
Everyone should have access to privacy, all citizens and criminals are very minority of a society so if they shut down mixers, or in future Bitcoin, because these things are used by criminals, they are violate basic human rights, that's not good.