[commoner]

Is any part of Google still operating in China? All Google domains are blocked in China. If you use an Android device in China with Google Play Services (or microG), you will not receive any push notifications through Firebase Cloud Messaging unless you use a VPN (or equivalent), and many VPNs are blocked or throttled to an unusable level. Even Android's internet connectivity check is broken in AOSP, since the Great Firewall blocks the android.com domain, which hosts the test page.