jm hs[úçuêÛ/nhó0h[¨©
ä'@Î\ æL§Doesn't matter how decentralized it is. They are acting as an exchange betweent one coin BTC and another LBTC. Even if no fiat is involved it still falls under FINCEN.
https://whatsonchain.com/tx/151a0c697ee512dfc109a78ea9bb233ebc9fbb1258638a67f5958ca5be20d59a