The smart contract for those tokens supports freezing. Tether just calls the freeze function on that address.

cowlevel an hour ago | parent | next [-]

And it's impossible to mix them because Ethereum is even anonymous than Bitcoin.

Isn't it already too late at that point? The tokens would have moved already.

	▲	petu an hour ago \| parent [-]
		Moved where? Moving to a different wallet wouldn't prevent freezing. It's 5B, impossible to cash out or exchange for different crypto quickly.