It's a bit hidden in the rhetoric, but Shinobi raises an important point in this article.

With CoinJoin, does everyone...

- send money to each other
- send money to themselves

(Technically, you can't really trace sats over the blockchain; each transaction destroys UTXOs and creates new UTXOs.)

https://bitcoinmagazine.com/legal/samourai-did-nothing-wrong-self-custodial-tools-are-not-money-transmitters