If you use their Firebase API on iOS or Android then you'll need to make a request for each object, whether it's a news post or comment. If you want to present a comment thread, then you need to request each comment individually, so imagine making 400 requests to present a 400 comment thread.
Their Github docs say to use the Firebase SDK, but the mobile SDKs require that you actually have your own Firebase account and you own the Firebase db, you can't enter an arbitrary Firebase URL and have it "just work."
Their Github docs say to use the Firebase SDK, but the mobile SDKs require that you actually have your own Firebase account and you own the Firebase db, you can't enter an arbitrary Firebase URL and have it "just work."