newbie24689 This is a take on FCM by the folks at sessions: [...]
Thanks! But I think that might say more about Session's carefulness than about how careful other apps using Firebase are, or what analytics Google does when possible.
Also... I think Google gets to find out that you are a Session user. I think they can associate your (for example) Gmail i.d. with you being a Session user, even if you put Gmail and Session in different profiles, because both apps will be getting push notifications to the same IP address close in time.