Like I said, Sceneform used Filament (not the other way around). I know of a few Google products that use Filament but having left the company I'm not sure what I'm at liberty to talk about unfortunately. Btw, I'm one of the authors of Filament :)
Sceneform != Filament. Sceneform was an AR-oriented framework that used Filament as its renderer. Filament itself is very much alive and under active development.