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To those who like me are not in the know, I think the parent comment is about an app that used to be called vigilante

https://en.wikipedia.org/wiki/Citizen_(app)

> Citizen is a mobile app that sends users location-based safety alerts in real time.[1][2][3][4] It allows users to read updates about ongoing reports, broadcast live video, and leave comments.[1][2] The app uses radio antennas installed in major cities to monitor 911 communications,[5] with employees filtering the audio to generate alerts.[5] In March 2020, Citizen added the COVID-19 digital contact tracer SafePass. The app is currently available for iOS and Android devices[6] in 20 cities,[7] including New York City, the San Francisco Bay Area, Baltimore, Los Angeles,[8] Philadelphia.[9] Detroit,[10] Indianapolis,[11] Phoenix,[12][13] Cincinnati,[14] Chicago, Minneapolis, Saint Paul, and Cleveland.[15]