>>Avoiding being where ICE agents are is not against the law.
Sure if you are the one avoiding arrest. How about if you rob a bank and I help you evade arrest? You could make a case that these apps are doing something similar. With a good prosecutor I wouldn't want to take my chances defending myself against that.
>>Crossing the border not at a designated point of crossing is against the law; this app is not for that.
True - but to argue the point - it could be used for that. If you had a map of where ICE/Border Patrol was it might aid in a successful crossing. Probably a bit OT though.