Several possibilities I could think of: 1) each one they take down, they get evidence that helps with the next one, so that's what determines the order they go

Several possibilities I could think of: 1) each one they take down, they get evidence that helps with the next one, so that's what determines the order they go in 2) they know people who need more time to get out of USDT, and they like those people (not a legit reason but could be the reason) 3) when they take down Tether, the impact on world financial system will be bigger than those others, for example if most of what they have is Chinese real estate bonds at face value, otherwise it's an empty shell, then they may be too nervous about the shockwaves from that. Instead of TooBigToFail it would be TooBigToMakeFail. Just a few speculations; I predict we'll find out this year though!