Several weeks earlier, major crypto exchange FTX announced that they had removed HUSD from their USD basket, meaning they would not be able to be used as collateral.
Huobi worked to distance itself from HUSD as the coin de-pegged, emphasizing that the token is maintained by a different entity and claiming to have exited their stake in that entity in April. However, the token was originally launched by Huobi in 2018, and Huobi has continued to run promotions involving the token as recently as July.