That's, at the minimum, debatable. The primary point of people reporting on the location if ICE agents is to enable other people to evade or interfere with law enforcement. And that walks right into the illegal zone in various ways - accessory, obstruction, interference, aiding and abetting, and so on.
It really isn't debatable. You aren't responsible for what other people do with information you give them. If someone told you "I'm going to commit a crime, tell me if the police are nearby" it would be probably illegal to tell them (as furtherance to a conspiracy), but without an agreement to help commit an illegal act it's totally legal
No agreement is necessary under law, only knowledge of an illegal activity and an intent to help it succeed. Agreements just tack on new charges like criminal conspiracy. This is why the peer comment about Waze is interesting. They likely have a fairly strong argument that it's simply sharing publicly available information - which is of course 100% legal, while I think ICEBlock will likely lose a very open and shut case because it's entire purpose is to facilitate the evasion or disruption of law enforcement.
I expect the government is probably thrilled to get sued by ICEBlock precisely because of this. It's probably about as favorable a case as they could ever find, and ICEBlock losing will set a highly useful (from the government's perspective) legal precedent which will then probably be weaponized to go after stuff like Waze.
