Why Google (FCM) notifications on Android are dangerous

Everyone knows that the content of the notification is encrypted, BUT THIS IS NOT ENOUGH:

https://www.privacy-handbuch.de/handbuch_73.htm

Requests to the PM Team (for example, for the implementation of Unified Push) have been ignored for many years.

For some people, using a safe ProtonMail app with a dangerous FCM can be a disaster in some countries (journalists, signals, political opposition, etc.)

Please repair it!