maryb Which brings me to the same question, how come Signal working when I don't have GSF on that profile?
Signal is designed to work without Google services.
By default, Signal uses Google Play Service for push notifications, but if it is not available, it uses websocket push instead.
I also recommend Molly instead of Signal.
It is a hardened Signal fork for Android.
It works without Google services and is 100% foss.
https://molly.im