The point is that there is no prior case law specifically prohibiting them from doing this. Until communication on the Internet is afforded the same rights as print and speech, there is no reason that ICE, etc. cannot demand a site be removed in this same manner for whatever reason they choose.
That's irrelevant to the general problem. Yes, they are counterfeit goods in this case, but this country LOVES precedent. But where does it stop? Can I bring down a website because it is opposite to the views of Congress? If this is going to be continued, there needs to be strict legal guidelines to prevent abuse of power from ANY power. This is what is worrisome.