Meta services is not a part of any package, but it’s an independent package com.facebook.services that a lot of manufacturers preinstall as a system app, because they get paid for that by meta. The package runs in the background and most meta apps communicate with it, use it for push notifications etc… You can uninstall the app with ADB command adb shell pm uninstall -k --user 0 com.facebook.services.
If you have com.facebook.services you may also other meta system packages com.facebook.system and com.facebook.appmanager preinstalled on your phone.