I warned everyone that this could happen, and I think other big centralized exchanges are going to continue doing the same thing soon.
It is better not to keep anything in USDT long term. just for short term trade and use only non-custodial wallets.
Recentčy I saw coinbase not even allowing customers to withdraw any coins from their own account... for ''protection'' they say, this is how bad they are  
I hope people will understand that centralized exchange are worse than banks.