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Facebook pays manufacturers like Samsung and Xiaomi billions to embed itself as a system app with elevated privileges. There's no uninstall button, only "Disable." Even disabled, background services like com.facebook.appmanager still run. I rooted my phone and deleted it. It reinstalled itself through a hidden system-level installer. The only real fix is root access and manually removing it from /system/priv-app/.
Now the uncomfortable part. Facebook is a US company. Under FISA 702 and the CLOUD Act, US agencies can compel them to hand over data on anyone, anywhere, without a warrant. This system-level service sits on billions of devices in every country on earth. You never consented to it. No opt-in, no EULA, nothing. It's just there because your phone manufacturer got paid.
To remove it you need root. Delete Facebook packages from /system/priv-app/, or flash a clean ROM like GrapheneOS. If you can't root, use NetGuard to block Facebook from reaching the network. The fact that any of this is necessary on a phone you paid for is the actual problem.
