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https://github.com/chenxiaolong/BasicSync#permissions

ACCESS_WIFI_STATE, ACCESS_COARSE_LOCATION, ACCESS_FINE_LOCATION, ACCESS_BACKGROUND_LOCATION, FOREGROUND_SERVICE_LOCATION

Optionally used for stopping Syncthing unless connected to specific Wi-Fi networks.

And location isn’t a permission granted by default on install (unlike Internet access), the user has to approve of it explicitly.