That's great news! We plan to implement this in DAVx⁵, too: https://github.com/bitfireAT/davx5-ose/issues/1321
Do I understand correctly that the approach for FCM w/o hosted gateway "only" works if there's only one VAPID key?
In case of multiple WebDAV-Push servers, they'd have different VAPID keys. In this case we could still provide a DAVx⁵ gateway or suggest another distributor, right?
But getting Push over FCM for the big fraction of users who only need Push for one account would absolutely be awesome!