The existence of the app is horrifying but the real problem is if an ICE agent violates your rights, you can't really sue them (I mean, you can sue them but it will just get thrown out of court because of their sovereign immunity and the fact that the current Supreme Court would never grant you a Bivens action for anything Trump's ICE did to you).

As long as they can claim that whatever they did to you is part of their official duties (which, again, good luck expecting the current federal government to take your side on this even if the ICE officer clearly oversteps their duties) only the federal government/DOJ can prosecute them for misconduct, which also obviously won't happen under the current administration.