Depends on local laws and jurisdiction. US famously has no communication secrecy laws, some countries states broadcast is free to listen, etc. But I think the

Depends on local laws and jurisdiction. US famously has no communication secrecy laws, some countries states broadcast is free to listen, etc. But I think the point made in GP is tracking people, although indirectly, could qualify as `human subject research`, the same technical category as Stanford prison experiment, MKULTRA project, standard website A/B testing, etc. I don't think it's going to be a problem per se, but can be an opportunity to discuss and learn about ethics and processes.