Wallet with 3.5 million USDT and hundreds of transactions blacklisted

A wallet with 3.5 million USDT and hundreds of transactions in the past few days has just been blacklisted. On-chain detective ZachXBT commented that the wallet looks like an over-the-counter trade or service. They recently received a bunch of USDT from Thorchain and are curious if this is related to the North Korean blacklist. They also received funds from the Stake hack, so it is indeed related to North Korea.