Yes - this appears to be a problem limited to the unlocked versions. We can't remove/uninstall the app AND even when you disable both the app and the app manager - IT STILL UPDATES!
This is a garbage move by Samsung. I've never owned an iPhone until today but Facebook has a perverse mentality and I won't be supporting their business model if I can help it.
Someone tell Samsung to stop with this practice. They have healthy financials so to have Facebook subsidize their costs with intrusive methods is disgusting. Goodbye S9, your fingerprint reader/monitor was cool.