I could think of interesting use. In India currently mini Kumbh Mela(https://en.m.wikipedia.org/wiki/Kumbh_Mela https://en.m.wikipedia.org/wiki/Kumbh_Mela) is g

I could think of interesting use. In India currently mini Kumbh Mela(https://en.m.wikipedia.org/wiki/Kumbh_Mela https://en.m.wikipedia.org/wiki/Kumbh_Mela) is going on. Police and organisers can use this technique to estimate and monitor crowd. I bet they are already using sophisticated crowd monitoring techniques (https://tech.economictimes.indiatimes.com/news/technology/kumbh-mela-becomes-a-lab-for-tech-industry-to-study-crowd-management/51804234 https://tech.economictimes.indiatimes.com/news/technology/ku...) but more the merrier.