Just positive feedback for the Firebase team! I'm a retired software engineer developing small 2-D Android-based games for my family and others.
The real-time database allows me to run these games across the web, among mukltiple Android devices, with no need for a "back-end", and is so much cleaner and easier to set up and use than the Android Bluetooth APIs, which are of course limited in scope and reach.
THANK YOU to the Firebase team for providing such an elegant service.