Apple has yanked an app called HKmap.live from its app store just days after approving it. The app used crowdsourcing to track the location of protestors and police officers in real time. The app's anonymous author says it's intended to help people in Hong Kong stay safe by avoiding potentially dangerous areas.

https://arstechnica.com/tech-policy/2019/10/apple-approves-then-bans-hong-kong-app-after-chinese-criticism/