This is a very exciting development, it's great to see more developers take this centralisation issue seriously.

On this subject, many people including myself have been failing (hard) to convince Moxie that dropping FCM (or GCM or whatever the name) is the way to go for Signal, if anyone want to give a hand...

https://www.reddit.com/r/signal/comments/9ekawn/moxie_drop_t...

https://github.com/signalapp/Signal-Android/issues/7638