Well, other agencies have mostly used things like this to collect evidence against real crimes. ICE is using it to enforce Orwellian "thought crimes" where they are revoking visas and green cards, and then often just minutes or hours later violently kidnapping people for their political views. Over 6,000 USA college students so far have had their visas revoked and been targeted by ICE officers, for exercising their constitutional right to freedom of speech and freedom of association.

>Why is it surprising if another law enforcement agency like ICE uses it?

I think the nuance is how they'll use the information: less random pick-ups (and associated crowds), versus more targetted swoops.

ICE is not law enforcement.

They are thugs that see themselves as above the law.

Sure, that's what they call themselves.

And the Democratic People's Republic of Korea is a democracy :)

Agencies with checks and balances maybe. But this is extra-legal in so many ways.