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already happening and it seems it is legal https://www.reuters.com/legal/government/citizens-are-tracking-ice-real-time-warn-migrants-is-that-legal-2025-09-04/

• DrScientist 7d ago
  Another area that's also existed for quite a while is the crowd-sourcing of the positions of mobile speed traps. Though bizarrely in the UK that's legal if you do it via Waze, not if you do it via whatsapp.